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Generate individual certificates for k8s hosts

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This commit is contained in:
Matthew Mosesohn 2016-12-27 14:02:45 +03:00
parent 3b0918981e
commit 3f274115b0
6 changed files with 101 additions and 39 deletions
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6
roles/kubernetes/master/templates/manifests/kube-apiserver.manifest.j2
View file

@ -35,10 +35,10 @@ spec:
- --service-node-port-range={{ kube_apiserver_node_port_range }}
- --client-ca-file={{ kube_cert_dir }}/ca.pem
- --basic-auth-file={{ kube_users_dir }}/known_users.csv
- --tls-cert-file={{ kube_cert_dir }}/apiserver.pem
- --tls-private-key-file={{ kube_cert_dir }}/apiserver-key.pem
- --tls-cert-file={{ kube_cert_dir }}/apiserver-{{ inventory_hostname }}.pem
- --tls-private-key-file={{ kube_cert_dir }}/apiserver-{{ inventory_hostname }}-key.pem
- --token-auth-file={{ kube_token_dir }}/known_tokens.csv
- --service-account-key-file={{ kube_cert_dir }}/apiserver-key.pem
- --service-account-key-file={{ kube_cert_dir }}/apiserver-{{ inventory_hostname }}-key.pem
- --secure-port={{ kube_apiserver_port }}
- --insecure-port={{ kube_apiserver_insecure_port }}
{% if kube_api_runtime_config is defined %}

2
roles/kubernetes/master/templates/manifests/kube-controller-manager.manifest.j2
View file

@ -23,7 +23,7 @@ spec:
- controller-manager
- --master={{ kube_apiserver_endpoint }}
- --leader-elect=true
- --service-account-private-key-file={{ kube_cert_dir }}/apiserver-key.pem
- --service-account-private-key-file={{ kube_cert_dir }}/apiserver-{{ inventory_hostname }}-key.pem
- --root-ca-file={{ kube_cert_dir }}/ca.pem
- --cluster-signing-cert-file={{ kube_cert_dir }}/ca.pem
- --cluster-signing-key-file={{ kube_cert_dir }}/ca-key.pem

4
roles/kubernetes/node/templates/node-kubeconfig.yaml.j2
View file

@ -8,8 +8,8 @@ clusters:
users:
- name: kubelet
user:
client-certificate: {{ kube_cert_dir }}/node.pem
client-key: {{ kube_cert_dir }}/node-key.pem
client-certificate: {{ kube_cert_dir }}/node-{{ inventory_hostname }}.pem
client-key: {{ kube_cert_dir }}/node-{{ inventory_hostname }}-key.pem
contexts:
- context:
cluster: local

47
roles/kubernetes/secrets/files/make-ssl.sh
View file

@ -27,8 +27,11 @@ Usage : $(basename $0) -f <config> [-d <ssldir>]
-f | --config : Openssl configuration file
-d | --ssldir : Directory where the certificates will be installed
ex :
$(basename $0) -f openssl.conf -d /srv/ssl
Environmental variables MASTERS and HOSTS should be set to generate keys
for each host.
ex :
MASTERS=node1 HOSTS="node1 node2" $(basename $0) -f openssl.conf -d /srv/ssl
EOF
}
@ -61,21 +64,37 @@ cd "${tmpdir}"
mkdir -p "${SSLDIR}"
# Root CA
openssl genrsa -out ca-key.pem 2048 > /dev/null 2>&1
openssl req -x509 -new -nodes -key ca-key.pem -days 10000 -out ca.pem -subj "/CN=kube-ca" > /dev/null 2>&1
if [ -e "$SSLDIR/ca-key.pem" ]; then
# Reuse existing CA
cp $SSLDIR/{ca.pem,ca-key.pem} .
else
openssl genrsa -out ca-key.pem 2048 > /dev/null 2>&1
openssl req -x509 -new -nodes -key ca-key.pem -days 10000 -out ca.pem -subj "/CN=kube-ca" > /dev/null 2>&1
fi
# Apiserver
openssl genrsa -out apiserver-key.pem 2048 > /dev/null 2>&1
openssl req -new -key apiserver-key.pem -out apiserver.csr -subj "/CN=kube-apiserver" -config ${CONFIG} > /dev/null 2>&1
openssl x509 -req -in apiserver.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out apiserver.pem -days 365 -extensions v3_req -extfile ${CONFIG} > /dev/null 2>&1
cat ca.pem >> apiserver.pem
if [ -n "$MASTERS" ]; then
for host in $MASTERS; do
# kube-apiserver key
openssl genrsa -out apiserver-${host}-key.pem 2048 > /dev/null 2>&1
openssl req -new -key apiserver-${host}-key.pem -out apiserver-${host}.csr -subj "/CN=kube-apiserver-${host}" -config ${CONFIG} > /dev/null 2>&1
openssl x509 -req -in apiserver-${host}.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out apiserver-${host}.pem -days 365 -extensions v3_req -extfile ${CONFIG} > /dev/null 2>&1
cat ca.pem >> apiserver-${host}.pem
# admin key
openssl genrsa -out admin-${host}-key.pem 2048 > /dev/null 2>&1
openssl req -new -key admin-${host}-key.pem -out admin-${host}.csr -subj "/CN=kube-admin-${host}" > /dev/null 2>&1
openssl x509 -req -in admin-${host}.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out admin-${host}.pem -days 365 > /dev/null 2>&1
done
fi
# Nodes and Admin
for i in node admin; do
openssl genrsa -out ${i}-key.pem 2048 > /dev/null 2>&1
openssl req -new -key ${i}-key.pem -out ${i}.csr -subj "/CN=kube-${i}" > /dev/null 2>&1
openssl x509 -req -in ${i}.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out ${i}.pem -days 365 > /dev/null 2>&1
done
if [ -n "$HOSTS" ]; then
for host in $HOSTS; do
openssl genrsa -out node-${host}-key.pem 2048 > /dev/null 2>&1
openssl req -new -key node-${host}-key.pem -out node-${host}.csr -subj "/CN=kube-node-${host}" > /dev/null 2>&1
openssl x509 -req -in node-${host}.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out node-${host}.pem -days 365 > /dev/null 2>&1
done
fi
# Install certs
mv *.pem ${SSLDIR}/

33
roles/kubernetes/secrets/tasks/check-certs.yml
View file

@ -1,36 +1,49 @@
---
- name: "Check_certs | check if the certs have already been generated on first master"
stat:
path: "{{ kube_cert_dir }}/ca.pem"
path: "{{ kube_cert_dir }}/{{ item }}"
delegate_to: "{{groups['kube-master'][0]}}"
register: kubecert_master
run_once: true
with_items: >-
['ca.pem',
{% for host in groups['k8s-cluster'] %}
'node-{{ host }}-key.pem'
{% if not loop.last %}{{','}}{% endif %}
{% endfor %}]
- name: "Check_certs | Set default value for 'sync_certs' and 'gen_certs' to false"
- name: "Check_certs | Set default value for 'sync_certs', 'gen_certs', and 'secret_changed' to false"
set_fact:
sync_certs: false
gen_certs: false
secret_changed: false
- name: "Check_certs | Set 'sync_certs' and 'gen_certs' to true"
- name: "Check_certs | Set 'gen_certs' to true"
set_fact:
gen_certs: true
when: not kubecert_master.stat.exists
when: "not {{ item.stat.exists }}"
run_once: true
with_items: "{{ kubecert_master.results }}"
- name: "Check certs | check if a cert already exists"
stat:
path: "{{ kube_cert_dir }}/ca.pem"
path: "{{ kube_cert_dir }}/{{ item }}"
register: kubecert
with_items:
- ca.pem
- node-{{ inventory_hostname }}-key.pem
- name: "Check_certs | Set 'sync_certs' to true"
set_fact:
sync_certs: true
when: >-
{%- set certs = {'sync': False} -%}
{%- for server in play_hosts
if (not hostvars[server].kubecert.stat.exists|default(False)) or
(hostvars[server].kubecert.stat.checksum|default('') != kubecert_master.stat.checksum|default('')) -%}
{%- set _ = certs.update({'sync': True}) -%}
{%- for host in groups['k8s-cluster'] %}
{% if host == inventory_hostname %}
{% if (not kubecert.results[0].stat.exists|default(False)) or
(kubecert.results[1].stat.checksum|default('') != kubecert_master.results[loop.index].stat.checksum|default('')) -%}
{%- set _ = certs.update({'sync': True}) -%}
{% endif %}
{% endif %}
{%- endfor -%}
{{ certs.sync }}
run_once: true

48
roles/kubernetes/secrets/tasks/gen_certs.yml
View file

@ -18,35 +18,65 @@
- name: Gen_certs | run cert generation script
command: "{{ kube_script_dir }}/make-ssl.sh -f {{ kube_config_dir }}/openssl.conf -d {{ kube_cert_dir }}"
environment:
- MASTERS: "{% for m in groups['kube-master'] %}
{% if hostvars[m].sync_certs|default(true) %}
{{ m }}
{% endif %}
{% endfor %}"
- HOSTS: "{% for h in groups['k8s-cluster'] %}
{% if hostvars[h].sync_certs|default(true) %}
{{ h }}
{% endif %}
{% endfor %}"
run_once: yes
delegate_to: "{{groups['kube-master'][0]}}"
when: gen_certs|default(false)
notify: set secret_changed
- set_fact:
master_certs: ['ca-key.pem', 'admin.pem', 'admin-key.pem', 'apiserver-key.pem', 'apiserver.pem']
node_certs: ['ca.pem', 'node.pem', 'node-key.pem']
all_master_certs: "['ca-key.pem',
{% for node in groups['kube-master'] %}
'admin-{{ node }}.pem',
'admin-{{ node }}-key.pem',
'apiserver-{{ node }}.pem',
'apiserver-{{ node }}-key.pem',
{% endfor %}]"
my_master_certs: ['ca-key.pem',
'admin-{{ inventory_hostname }}.pem',
'admin-{{ inventory_hostname }}-key.pem',
'apiserver-{{ inventory_hostname }}.pem',
'apiserver-{{ inventory_hostname }}-key.pem'
]
all_node_certs: "['ca.pem',
{% for node in groups['k8s-cluster'] %}
'node-{{ node }}.pem',
'node-{{ node }}-key.pem',
{% endfor %}]"
my_node_certs: ['ca.pem', 'node-{{ inventory_hostname }}.pem', 'node-{{ inventory_hostname }}-key.pem']
tags: facts
- name: Gen_certs | Gather master certs
shell: "tar cfz - -C {{ kube_cert_dir }} {{ master_certs|join(' ') }} {{ node_certs|join(' ') }} | base64 --wrap=0"
shell: "tar cfz - -C {{ kube_cert_dir }} {{ my_master_certs|join(' ') }} {{ all_node_certs|join(' ') }} | base64 --wrap=0"
register: master_cert_data
delegate_to: "{{groups['kube-master'][0]}}"
run_once: true
when: sync_certs|default(false)
when: inventory_hostname in groups['kube-master'] and sync_certs|default(false) and
inventory_hostname != groups['kube-master'][0]
- name: Gen_certs | Gather node certs
shell: "tar cfz - -C {{ kube_cert_dir }} {{ node_certs|join(' ') }} | base64 --wrap=0"
shell: "tar cfz - -C {{ kube_cert_dir }} {{ my_node_certs|join(' ') }} | base64 --wrap=0"
register: node_cert_data
delegate_to: "{{groups['kube-master'][0]}}"
run_once: true
when: sync_certs|default(false)
when: inventory_hostname in groups['kube-node'] and
sync_certs|default(false) and
inventory_hostname != groups['kube-master'][0]
- name: Gen_certs | Copy certs on masters
shell: "echo '{{master_cert_data.stdout|quote}}' | base64 -d | tar xz -C {{ kube_cert_dir }}"
changed_when: false
when: inventory_hostname in groups['kube-master'] and sync_certs|default(false) and
inventory_hostname != groups['kube-master'][0]
notify: set secret_changed
- name: Gen_certs | Copy certs on nodes
shell: "echo '{{node_cert_data.stdout|quote}}' | base64 -d | tar xz -C {{ kube_cert_dir }}"
@ -54,6 +84,7 @@
when: inventory_hostname in groups['kube-node'] and
sync_certs|default(false) and
inventory_hostname != groups['kube-master'][0]
notify: set secret_changed
- name: Gen_certs | check certificate permissions
file:
@ -93,4 +124,3 @@
- name: Gen_certs | update ca-certificates (RedHat)
command: update-ca-trust extract
when: kube_ca_cert.changed and ansible_os_family == "RedHat"