8cc84e132a
Add tags to allow more granular tasks filtering. Add generator script for MD formatted tags found. Add docs for tags how-to. Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
110 lines
4.2 KiB
Markdown
110 lines
4.2 KiB
Markdown
Ansible variables
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===============
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Inventory
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-------------
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The inventory is composed of 3 groups:
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* **kube-node** : list of kubernetes nodes where the pods will run.
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* **kube-master** : list of servers where kubernetes master components (apiserver, scheduler, controller) will run.
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Note: if you want the server to act both as master and node the server must be defined on both groups _kube-master_ and _kube-node_
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* **etcd**: list of server to compose the etcd server. you should have at least 3 servers for failover purposes.
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Below is a complete inventory example:
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```
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## Configure 'ip' variable to bind kubernetes services on a
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## different ip than the default iface
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node1 ansible_ssh_host=95.54.0.12 # ip=10.3.0.1
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node2 ansible_ssh_host=95.54.0.13 # ip=10.3.0.2
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node3 ansible_ssh_host=95.54.0.14 # ip=10.3.0.3
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node4 ansible_ssh_host=95.54.0.15 # ip=10.3.0.4
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node5 ansible_ssh_host=95.54.0.16 # ip=10.3.0.5
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node6 ansible_ssh_host=95.54.0.17 # ip=10.3.0.6
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[kube-master]
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node1
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node2
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[etcd]
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node1
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node2
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node3
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[kube-node]
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node2
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node3
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node4
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node5
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node6
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[k8s-cluster:children]
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kube-node
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kube-master
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etcd
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```
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Group vars
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--------------
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The main variables to change are located in the directory ```inventory/group_vars/all.yml```.
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Ansible tags
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------------
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The following tags are defined in playbooks:
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| Tag name | Used for
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|--------------------------|---------
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| apps | K8s apps definitions
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| azure | Cloud-provider Azure
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| bootstrap-os | Anything related to host OS configuration
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| calico | Network plugin Calico
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| canal | Network plugin Canal
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| cloud-provider | Cloud-provider related tasks
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| dnsmasq | Configuring DNS stack for hosts and K8s apps
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| download | Fetching container images
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| etcd | Configuring etcd cluster
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| etcd-pre-upgrade | Upgrading etcd cluster
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| etcd-secrets | Configuring etcd certs/keys
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| etchosts | Configuring /etc/hosts entries for hosts
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| facts | Gathering facts and misc check results
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| flannel | Network plugin flannel
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| gce | Cloud-provider GCP
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| hyperkube | Manipulations with K8s hyperkube image
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| k8s-pre-upgrade | Upgrading K8s cluster
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| k8s-secrets | Configuring K8s certs/keys
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| kpm | Installing K8s apps definitions with KPM
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| kube-apiserver | Configuring self-hosted kube-apiserver
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| kube-controller-manager | Configuring self-hosted kube-controller-manager
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| kubectl | Installing kubectl and bash completion
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| kubelet | Configuring kubelet service
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| kube-proxy | Configuring self-hosted kube-proxy
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| kube-scheduler | Configuring self-hosted kube-scheduler
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| master | Configuring K8s master node role
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| netchecker | Installing netchecker K8s app
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| network | Configuring networking plugins for K8s
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| nginx | Configuring LB for kube-apiserver instances
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| node | Configuring K8s minion (compute) node role
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| openstack | Cloud-provider OpenStack
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| preinstall | Preliminary configuration steps
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| resolvconf | Configuring /etc/resolv.conf for hosts/apps
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| upgrade | Upgrading, f.e. container images/binaries
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| weave | Network plugin Weave
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Note: Use the ``bash scripts/gen_tags.sh`` command to generate a list of all
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tags found in the codebase. New tags will be listed with the empty "Used for"
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field.
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Example command to filter and apply only DNS configuration tasks and skip
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everything else related to host OS configuration and downloading images of containers:
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```
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ansible-playbook -i inventory/inventory.ini cluster.yml --tags preinstall,dnsmasq,facts --skip-tags=download,bootstrap-os
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```
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And this play only removes the K8s cluster DNS resolver IP from hosts' /etc/resolv.conf files:
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```
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ansible-playbook -i inventory/inventory.ini -e dns_server='' cluster.yml --tags resolvconf
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```
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Note: use `--tags` and `--skip-tags` wise and only if you're 100% sure what you're doing.
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