[jjo] add DIND support to contrib/ (#3468)
* [jjo] add DIND support to contrib/ - add contrib/dind with ansible playbook to create "node" containers, and setup them to mimic host nodes as much as possible (using Ubuntu images), see contrib/dind/README.md - nodes' /etc/hosts editing via `blockinfile` and `lineinfile` need `unsafe_writes: yes` because /etc/hosts are mounted by docker, and thus can't be handled atomically (modify copy + rename) * dind-host role: set node container hostname on creation * add "Resulting deployment" section with some CLI outputs * typo * selectable node_distro: debian, ubuntu * some fixes for node_distro: ubuntu * cpu optimization: add early `pkill -STOP agetty` * typo * add centos dind support ;) * add kubespray-dind.yaml, support fedora - add kubespray-dind.yaml (former custom.yaml at README.md) - rework README.md as per above - use some YAML power to share distros' commonality - add fedora support * create unique /etc/machine-id and other updates - create unique /etc/machine-id in each docker node, used as seed for e.g. weave mac addresses - with above, now netchecker 100% passes WoHooOO! 🎉 🎉 🎉 - updated README.md output from (1.12.1, verified netcheck) * minor typos * fix centos node creation, needs earlier udevadm removal to avoid flaky facts, also verified netcheck Ok \o/ * add Q&D test-distros.sh, back to manual /etc/machine-id hack * run-test-distros.sh cosmetics and minor fixes * run-test-distros.sh: $rc fix and minor formatting changes * run-test-distros.sh output cosmetics
This commit is contained in:
JuanJo Ciarlante
Antoine Legrand
parent
fac8aaa44e
commit
4077934519
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@ -0,0 +1,152 @@
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# Kubespray DIND experimental setup
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This ansible playbook creates local docker containers
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to serve as Kubernetes "nodes", which in turn will run
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"normal" Kubernetes docker containers, a mode usually
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called DIND (Docker-IN-Docker).
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The playbook has two roles:
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- dind-host: creates the "nodes" as containers in localhost, with
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appropiate settings for DIND (privileged, volume mapping for dind
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storage, etc).
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- dind-cluster: customizes each node container to have required
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system packages installed, and some utils (swapoff, lsattr)
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symlinked to /bin/true to ease mimicking a real node.
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This playbook has been test with Ubuntu 16.04 as host and ubuntu:16.04
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as docker images (note that dind-cluster has specific customization
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for these images).
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The playbook also creates a `/tmp/kubespray.dind.inventory_builder.sh`
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helper (wraps up running `contrib/inventory_builder/inventory.py` with
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node containers IPs and prefix).
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## Deploying
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See below for a complete successful run:
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1. Create the node containers
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~~~~
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# From the kubespray root dir
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cd contrib/dind
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pip install -r requirements.txt
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ansible-playbook -i hosts dind-cluster.yaml
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# Back to kubespray root
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cd ../..
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~~~~
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NOTE: if the playbook run fails with something like below error
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message, you may need to specifically set `ansible_python_interpreter`,
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see `./hosts` file for an example expanded localhost entry.
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~~~
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failed: [localhost] (item=kube-node1) => {"changed": false, "item": "kube-node1", "msg": "Failed to import docker or docker-py - No module named requests.exceptions. Try `pip install docker` or `pip install docker-py` (Python 2.6)"}
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~~~
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2. Customize kubespray-dind.yaml
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Note that there's coupling between above created node containers
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and `kubespray-dind.yaml` settings, in particular regarding selected `node_distro`
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(as set in `group_vars/all/all.yaml`), and docker settings.
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~~~
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$EDITOR contrib/dind/kubespray-dind.yaml
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~~~
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3. Prepare the inventory and run the playbook
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~~~
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INVENTORY_DIR=inventory/local-dind
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mkdir -p ${INVENTORY_DIR}
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rm -f ${INVENTORY_DIR}/hosts.ini
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CONFIG_FILE=${INVENTORY_DIR}/hosts.ini /tmp/kubespray.dind.inventory_builder.sh
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ansible-playbook --become -e ansible_ssh_user=debian -i ${INVENTORY_DIR}/hosts.ini cluster.yml --extra-vars @contrib/dind/kubespray-dind.yaml
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~~~
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NOTE: You could also test other distros without editing files by
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passing `--extra-vars` as per below commandline,
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replacing `DISTRO` by either `debian`, `ubuntu`, `centos`, `fedora`:
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~~~
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cd contrib/dind
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ansible-playbook -i hosts dind-cluster.yaml --extra-vars node_distro=DISTRO
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cd ../..
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CONFIG_FILE=inventory/local-dind/hosts.ini /tmp/kubespray.dind.inventory_builder.sh
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ansible-playbook --become -e ansible_ssh_user=DISTRO -i inventory/local-dind/hosts.ini cluster.yml --extra-vars @contrib/dind/kubespray-dind.yaml --extra-vars bootstrap_os=DISTRO
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~~~
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## Resulting deployment
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See below to get an idea on how a completed deployment looks like,
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from the host where you ran kubespray playbooks.
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### node_distro: debian
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Running from an Ubuntu Xenial host:
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~~~
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$ uname -a
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Linux ip-xx-xx-xx-xx 4.4.0-1069-aws #79-Ubuntu SMP Mon Sep 24
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15:01:41 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
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$ docker ps
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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1835dd183b75 debian:9.5 "sh -c 'apt-get -qy …" 43 minutes ago Up 43 minutes kube-node5
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30b0af8d2924 debian:9.5 "sh -c 'apt-get -qy …" 43 minutes ago Up 43 minutes kube-node4
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3e0d1510c62f debian:9.5 "sh -c 'apt-get -qy …" 43 minutes ago Up 43 minutes kube-node3
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738993566f94 debian:9.5 "sh -c 'apt-get -qy …" 44 minutes ago Up 44 minutes kube-node2
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c581ef662ed2 debian:9.5 "sh -c 'apt-get -qy …" 44 minutes ago Up 44 minutes kube-node1
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$ docker exec kube-node1 kubectl get node
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NAME STATUS ROLES AGE VERSION
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kube-node1 Ready master,node 18m v1.12.1
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kube-node2 Ready master,node 17m v1.12.1
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kube-node3 Ready node 17m v1.12.1
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kube-node4 Ready node 17m v1.12.1
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kube-node5 Ready node 17m v1.12.1
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$ docker exec kube-node1 kubectl get pod --all-namespaces
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NAMESPACE NAME READY STATUS RESTARTS AGE
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default netchecker-agent-67489 1/1 Running 0 2m51s
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default netchecker-agent-6qq6s 1/1 Running 0 2m51s
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default netchecker-agent-fsw92 1/1 Running 0 2m51s
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default netchecker-agent-fw6tl 1/1 Running 0 2m51s
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default netchecker-agent-hostnet-8f2zb 1/1 Running 0 3m
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default netchecker-agent-hostnet-gq7ml 1/1 Running 0 3m
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default netchecker-agent-hostnet-jfkgv 1/1 Running 0 3m
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default netchecker-agent-hostnet-kwfwx 1/1 Running 0 3m
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default netchecker-agent-hostnet-r46nm 1/1 Running 0 3m
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default netchecker-agent-lxdrn 1/1 Running 0 2m51s
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default netchecker-server-864bd4c897-9vstl 1/1 Running 0 2m40s
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default sh-68fcc6db45-qf55h 1/1 Running 1 12m
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kube-system coredns-7598f59475-6vknq 1/1 Running 0 14m
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kube-system coredns-7598f59475-l5q5x 1/1 Running 0 14m
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kube-system kube-apiserver-kube-node1 1/1 Running 0 17m
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kube-system kube-apiserver-kube-node2 1/1 Running 0 18m
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kube-system kube-controller-manager-kube-node1 1/1 Running 0 18m
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kube-system kube-controller-manager-kube-node2 1/1 Running 0 18m
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kube-system kube-proxy-5xx9d 1/1 Running 0 17m
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kube-system kube-proxy-cdqq4 1/1 Running 0 17m
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kube-system kube-proxy-n64ls 1/1 Running 0 17m
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kube-system kube-proxy-pswmj 1/1 Running 0 18m
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kube-system kube-proxy-x89qw 1/1 Running 0 18m
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kube-system kube-scheduler-kube-node1 1/1 Running 4 17m
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kube-system kube-scheduler-kube-node2 1/1 Running 4 18m
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kube-system kubernetes-dashboard-5db4d9f45f-548rl 1/1 Running 0 14m
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kube-system nginx-proxy-kube-node3 1/1 Running 4 17m
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kube-system nginx-proxy-kube-node4 1/1 Running 4 17m
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kube-system nginx-proxy-kube-node5 1/1 Running 4 17m
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kube-system weave-net-42bfr 2/2 Running 0 16m
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kube-system weave-net-6gt8m 2/2 Running 0 16m
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kube-system weave-net-88nnc 2/2 Running 0 16m
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kube-system weave-net-shckr 2/2 Running 0 16m
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kube-system weave-net-xr46t 2/2 Running 0 16m
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$ docker exec kube-node1 curl -s http://localhost:31081/api/v1/connectivity_check
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{"Message":"All 10 pods successfully reported back to the server","Absent":null,"Outdated":null}
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~~~
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@ -0,0 +1,9 @@
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---
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- hosts: localhost
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gather_facts: False
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roles:
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- { role: dind-host }
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- hosts: containers
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roles:
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- { role: dind-cluster }
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# See distro.yaml for supported node_distro images
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node_distro: debian
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distro_settings:
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debian: &DEBIAN
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image: "debian:9.5"
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user: "debian"
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pid1_exe: /lib/systemd/systemd
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init: |
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sh -c "apt-get -qy update && apt-get -qy install systemd-sysv dbus && exec /sbin/init"
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raw_setup: apt-get -qy update && apt-get -qy install dbus python sudo iproute2
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raw_setup_done: test -x /usr/bin/sudo
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agetty_svc: getty@*
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ssh_service: ssh
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extra_packages: []
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ubuntu:
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<<: *DEBIAN
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image: "ubuntu:16.04"
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user: "ubuntu"
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init: |
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/sbin/init
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centos: &CENTOS
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image: "centos:7"
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user: "centos"
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pid1_exe: /usr/lib/systemd/systemd
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init: |
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/sbin/init
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raw_setup: yum -qy install policycoreutils dbus python sudo iproute iptables
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raw_setup_done: test -x /usr/bin/sudo
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agetty_svc: getty@* serial-getty@*
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ssh_service: sshd
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extra_packages: []
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fedora:
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<<: *CENTOS
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image: "fedora:latest"
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user: "fedora"
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raw_setup: yum -qy install policycoreutils dbus python sudo iproute iptables; mkdir -p /etc/modules-load.d
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extra_packages:
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- hostname
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- procps
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- findutils
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- kmod
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- iputils
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@ -0,0 +1,15 @@
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[local]
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# If you created a virtualenv for ansible, you may need to specify running the
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# python binary from there instead:
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#localhost ansible_connection=local ansible_python_interpreter=/home/user/kubespray/.venv/bin/python
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localhost ansible_connection=local
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[containers]
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kube-node1
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kube-node2
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kube-node3
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kube-node4
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kube-node5
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[containers:vars]
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ansible_connection=docker
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@ -0,0 +1,24 @@
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# kubespray-dind.yaml: minimal kubespray ansible playbook usable for DIND
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# See contrib/dind/README.md
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kube_api_anonymous_auth: true
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kubeadm_enabled: true
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kubelet_fail_swap_on: false
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# Docker nodes need to have been created with same "node_distro: debian"
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# at contrib/dind/group_vars/all/all.yaml
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bootstrap_os: debian
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docker_version: latest
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docker_storage_options: -s overlay2 --storage-opt overlay2.override_kernel_check=true -g /dind/docker
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dns_mode: coredns
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kube_network_plugin: weave
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deploy_netchecker: True
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netcheck_agent_image_repo: quay.io/l23network/k8s-netchecker-agent
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netcheck_server_image_repo: quay.io/l23network/k8s-netchecker-server
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netcheck_agent_image_tag: v1.0
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netcheck_server_image_tag: v1.0
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@ -0,0 +1 @@
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docker
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- name: set_fact distro_setup
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set_fact:
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distro_setup: "{{ distro_settings[node_distro] }}"
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- name: set_fact other distro settings
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set_fact:
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distro_user: "{{ distro_setup['user'] }}"
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distro_ssh_service: "{{ distro_setup['ssh_service'] }}"
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distro_extra_packages: "{{ distro_setup['extra_packages'] }}"
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- name: Null-ify some linux tools to ease DIND
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file:
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src: "/bin/true"
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dest: "{{item}}"
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state: link
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force: yes
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with_items:
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# DIND box may have swap enable, don't bother
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- /sbin/swapoff
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# /etc/hosts handling would fail on trying to copy file attributes on edit,
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# void it by successfully returning nil output
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- /usr/bin/lsattr
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# disable selinux-isms, sp needed if running on non-Selinux host
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- /usr/sbin/semodule
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- name: Void installing dpkg docs and man pages on Debian based distros
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copy:
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content: |
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# Delete locales
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path-exclude=/usr/share/locale/*
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# Delete man pages
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path-exclude=/usr/share/man/*
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# Delete docs
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path-exclude=/usr/share/doc/*
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path-include=/usr/share/doc/*/copyright
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dest: /etc/dpkg/dpkg.cfg.d/01_nodoc
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when:
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- ansible_os_family == 'Debian'
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- name: Install system packages to better match a full-fledge node
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package:
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name: "{{ item }}"
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state: present
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with_items: "{{ distro_extra_packages }} + [ 'rsyslog', 'openssh-server' ]"
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- name: Start needed services
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service:
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name: "{{ item }}"
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state: started
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with_items:
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- rsyslog
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- "{{ distro_ssh_service }}"
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- name: Create distro user "{{distro_user}}"
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user:
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name: "{{ distro_user }}"
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uid: 1000
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#groups: sudo
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append: yes
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- name: Allow password-less sudo to "{{ distro_user }}"
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copy:
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content: "{{ distro_user }} ALL=(ALL) NOPASSWD:ALL"
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dest: "/etc/sudoers.d/{{ distro_user }}"
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- name: Add my pubkey to "{{ distro_user }}" user authorized keys
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authorized_key:
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user: "{{ distro_user }}"
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state: present
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key: "{{ lookup('file', lookup('env','HOME') + '/.ssh/id_rsa.pub') }}"
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- name: set_fact distro_setup
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set_fact:
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distro_setup: "{{ distro_settings[node_distro] }}"
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- name: set_fact other distro settings
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set_fact:
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distro_image: "{{ distro_setup['image'] }}"
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distro_init: "{{ distro_setup['init'] }}"
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distro_pid1_exe: "{{ distro_setup['pid1_exe'] }}"
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distro_raw_setup: "{{ distro_setup['raw_setup'] }}"
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distro_raw_setup_done: "{{ distro_setup['raw_setup_done'] }}"
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distro_agetty_svc: "{{ distro_setup['agetty_svc'] }}"
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- name: Create dind node containers from "containers" inventory section
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docker_container:
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image: "{{ distro_image }}"
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name: "{{ item }}"
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state: started
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hostname: "{{ item }}"
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command: "{{ distro_init }}"
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#recreate: yes
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privileged: true
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tmpfs:
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- /sys/module/nf_conntrack/parameters
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volumes:
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- /boot:/boot
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- /lib/modules:/lib/modules
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- "{{ item }}:/dind/docker"
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register: containers
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with_items: "{{groups.containers}}"
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tags:
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- addresses
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- name: Gather list of containers IPs
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set_fact:
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addresses: "{{ containers.results | map(attribute='ansible_facts') | map(attribute='docker_container') | map(attribute='NetworkSettings') | map(attribute='IPAddress') | list }}"
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tags:
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- addresses
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- name: Create inventory_builder helper already set with the list of node containers' IPs
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template:
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src: inventory_builder.sh.j2
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dest: /tmp/kubespray.dind.inventory_builder.sh
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mode: 0755
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tags:
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- addresses
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- name: Install needed packages into node containers via raw, need to wait for possible systemd packages to finish installing
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raw: |
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# agetty processes churn a lot of cpu time failing on inexistent ttys, early STOP them, to rip them in below task
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pkill -STOP agetty || true
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{{ distro_raw_setup_done }} && echo SKIPPED && exit 0
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until [ "$(readlink /proc/1/exe)" = "{{ distro_pid1_exe }}" ] ; do sleep 1; done
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{{ distro_raw_setup }}
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delegate_to: "{{ item._ansible_item_label }}"
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with_items: "{{ containers.results }}"
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register: result
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changed_when: result.stdout.find("SKIPPED") < 0
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- name: Remove gettys from node containers
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raw: |
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until test -S /var/run/dbus/system_bus_socket; do sleep 1; done
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systemctl disable {{ distro_agetty_svc }}
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systemctl stop {{ distro_agetty_svc }}
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delegate_to: "{{ item._ansible_item_label }}"
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with_items: "{{ containers.results }}"
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changed_when: false
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# Running systemd-machine-id-setup doesn't create a unique id for each node container on Debian,
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# handle manually
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- name: Re-create unique machine-id (as we may just get what comes in the docker image), needed by some CNIs for mac address seeding (notably weave)
|
||||
raw: |
|
||||
echo {{ item | hash('sha1') }} > /etc/machine-id.new
|
||||
mv -b /etc/machine-id.new /etc/machine-id
|
||||
cmp /etc/machine-id /etc/machine-id~ || true
|
||||
systemctl daemon-reload
|
||||
delegate_to: "{{ item._ansible_item_label }}"
|
||||
with_items: "{{ containers.results }}"
|
||||
|
||||
- name: Early hack image install to adapt for DIND
|
||||
raw: |
|
||||
rm -fv /usr/bin/udevadm /usr/sbin/udevadm
|
||||
delegate_to: "{{ item._ansible_item_label }}"
|
||||
with_items: "{{ containers.results }}"
|
||||
register: result
|
||||
changed_when: result.stdout.find("removed") >= 0
|
||||
|
|
@ -0,0 +1,3 @@
|
|||
#!/bin/bash
|
||||
# NOTE: if you change HOST_PREFIX, you also need to edit ./hosts [containers] section
|
||||
HOST_PREFIX=kube-node python3 contrib/inventory_builder/inventory.py {% for ip in addresses %} {{ ip }} {% endfor %}
|
||||
|
|
@ -0,0 +1,46 @@
|
|||
#!/bin/bash
|
||||
# Q&D test'em all: creates full DIND kubespray deploys
|
||||
# for each distro, verifying it via netchecker.
|
||||
|
||||
pass_or_fail() {
|
||||
local rc="$?"
|
||||
local msg="$*"
|
||||
local date="$(date -Isec)"
|
||||
[ $rc -eq 0 ] && echo "PASS: [$date] $msg" || echo "FAIL: [$date] $msg"
|
||||
}
|
||||
test_distro() {
|
||||
local distro=${1:?}
|
||||
ansible-playbook -i hosts dind-cluster.yaml --extra-vars node_distro=$distro
|
||||
pass_or_fail "$distro: dind-nodes"
|
||||
(cd ../..
|
||||
INVENTORY_DIR=inventory/local-dind
|
||||
mkdir -p ${INVENTORY_DIR}
|
||||
rm -f ${INVENTORY_DIR}/hosts.ini
|
||||
CONFIG_FILE=${INVENTORY_DIR}/hosts.ini /tmp/kubespray.dind.inventory_builder.sh
|
||||
ansible-playbook --become -e ansible_ssh_user=$distro -i \
|
||||
${INVENTORY_DIR}/hosts.ini cluster.yml \
|
||||
--extra-vars @contrib/dind/kubespray-dind.yaml --extra-vars bootstrap_os=$distro
|
||||
pass_or_fail "$distro: kubespray"
|
||||
)
|
||||
docker exec kube-node1 kubectl get pod --all-namespaces
|
||||
pass_or_fail "$distro: kube-api"
|
||||
let n=60
|
||||
while ((n--)); do
|
||||
docker exec kube-node1 curl -s http://localhost:31081/api/v1/connectivity_check | grep successfully && break
|
||||
sleep 2
|
||||
done
|
||||
[ $n -ge 0 ]
|
||||
pass_or_fail "$distro: netcheck"
|
||||
}
|
||||
|
||||
# Get all DISTROS from distro.yaml if $* unset (shame no yaml parsing, but nuff anyway)
|
||||
DISTROS="${*:-$(egrep -o '^ \w+' group_vars/all/distro.yaml|paste -s)}"
|
||||
NODES="$(egrep ^kube-node hosts|paste -s)"
|
||||
echo "DISTROS=${DISTROS}"
|
||||
for distro in ${DISTROS}; do
|
||||
docker rm -f ${NODES}
|
||||
{ time test_distro ${distro} ;} |& tee test-${distro}.out
|
||||
# sleeping for the sake of the human to verify if they want
|
||||
sleep 2m
|
||||
done
|
||||
egrep '^(PASS:|FAIL:|real)' $(ls -tr test-*out)
|
||||
|
|
@ -8,6 +8,7 @@
|
|||
state: present
|
||||
create: yes
|
||||
backup: yes
|
||||
unsafe_writes: yes
|
||||
marker: "# Ansible inventory hosts {mark}"
|
||||
when: populate_inventory_to_hosts_file
|
||||
|
||||
|
|
@ -18,6 +19,7 @@
|
|||
line: "{{ loadbalancer_apiserver.address }} {{ apiserver_loadbalancer_domain_name }}"
|
||||
state: present
|
||||
backup: yes
|
||||
unsafe_writes: yes
|
||||
when:
|
||||
- loadbalancer_apiserver is defined
|
||||
- loadbalancer_apiserver.address is defined
|
||||
|
|
@ -51,4 +53,5 @@
|
|||
regexp: "^{{ item.key }}.*$"
|
||||
state: present
|
||||
backup: yes
|
||||
unsafe_writes: yes
|
||||
with_dict: "{{ etc_hosts_localhosts_dict_target }}"
|
||||
|
|
|
|||
Loading…
Reference in New Issue