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Install etcd cluster

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Paul-Henri Froidmont 2018-09-20 01:14:41 +02:00
parent e0b240c7bd
commit 7e1e5f9c91
13 changed files with 55 additions and 1033 deletions
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4
group_vars/all/vars
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@ -16,9 +16,7 @@ k8s_encryption_config_directory: "{{k8s_config_directory}}"
k8s_interface: "{{peervpn_conf_interface}}" k8s_interface: "{{peervpn_conf_interface}}"
k8s_conf_dir: /etc/kubernetes k8s_conf_dir: /etc/kubernetes
etcd_version: "3.1.12" etcd_version: "3.2.24"
etcd_bin_dir: "/usr/local/bin"
etcd_client_port: "2379"
harden_linux_root_password: "{{k8s_scaleway_root_password}}" harden_linux_root_password: "{{k8s_scaleway_root_password}}"
harden_linux_deploy_user: deploy harden_linux_deploy_user: deploy

4
k8s.yml
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@ -5,6 +5,10 @@
tags: proxy tags: proxy
- role: docker - role: docker
tags: docker tags: docker
- hosts: k8s_masters
roles:
- role: etcd
tags: etcd
#- hosts: localhost #- hosts: localhost
# become: yes # become: yes
# gather_facts: no # gather_facts: no

674
roles/etcd/LICENSE
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@ -1,674 +0,0 @@
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You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
{project} Copyright (C) {year} {fullname}
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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@ -1,151 +0,0 @@
ansible-role-etcd
=================
This Ansible playbook is used in [Kubernetes the not so hard way with Ansible (at Scaleway) - Part 5 - etcd cluster](https://www.tauceti.blog/post/kubernetes-the-not-so-hard-way-with-ansible-at-scaleway-part-5/). Have a look there for more information.
Installes a etcd cluster. HINT: This playbook does NOT reload or restart the etcd cluster nodes after the systemd service file was changed! This is intentional! It would be a very bad idea to restart all etcd nodes at the same time. So if the `etcd.service` file has changed restart/reload etcd by hand one node after the other and check log output if the node joined the cluster again afterwards! As a side node: The script will issue a `systemctl daemon-reload` after the etcd service file was changed so that at least systemd is aware of the changed file and you don't take care about that. So a reboot of a etcd node would also active the new configuration.
Versions
--------
I tag every release and try to stay with [semantic versioning](http://semver.org) (well some kind of). If you want to use the role I recommend to checkout the latest tag. The master branch is basically development while the tags mark stable releases. But in general I try to keep master in good shape too. A tag `r1.0.0_v3.2.8` means this is release 1.0.0 of this role and it's meant to be used with etcd version 3.2.8. If the role itself changes `rX.Y.Z` will increase. If the etcd version changes `vX.Y.Z` will increase. This allows to tag bugfixes and new major versions of the role while it's still developed for a specific etcd release.
Changelog
---------
**r4.2.0_v3.2.13**
- changed `listen-client-urls` scheme for 127.0.0.1 from http to https
**r4.1.0_v3.2.13**
- use full path for destination in download etcd task
- chown/chgrp to "root" user for unarchived etcd files
**r4.0.0_v3.2.13**
- fix bug `etcd_data_dir` variable missing
**r3.1.0_v3.2.13**
- move some variables into etcd_settings dictionary. As they're not needed outside of the etcd role there is no need to keep them seperate.
**r3.0.0_v3.2.13**
- introduce flexible etcd parameter settings via `etcd_settings/etcd_settings_user` variables. This way all flags/settings of the current and future etcd version's can be set and there is no need to adjust the etcd systemd service file template with every release
**r2.0.0_v3.2.13**
- updated etcd to 3.2.13
- added new etcd flags (see role variables below)
- change default for `k8s_ca_conf_directory` (see role variables below). If you already defined `k8s_ca_conf_directory` by yourself in `group_vars/k8s.yml` or `group_vars/all.yml` nothing changes for you
- more documentation for role variables
**r1.0.0_v3.2.8**
- updated etcd to 3.2.8
- rename `local_cert_dir` to `k8s_ca_conf_directory` and change default location
- smaller changes needed for Kubernetes v1.8
Requirements
------------
This playbook requires that you already created some certificates for etcd (see [Kubernetes the not so hard way with Ansible (at Scaleway) - Part 4 - Certificate authority (CA)](https://www.tauceti.blog/post/kubernetes-the-not-so-hard-way-with-ansible-at-scaleway-part-4/)). The playbook searches the certificates in `k8s_ca_conf_directory` on the host this playbook runs.
Role Variables
--------------
```
# The directory from where to copy the K8s certificates. By default this
# will expand to user's LOCAL $HOME (the user that run's "ansible-playbook ..."
# plus "/k8s/certs". That means if the user's $HOME directory is e.g.
# "/home/da_user" then "k8s_ca_conf_directory" will have a value of
# "/home/da_user/k8s/certs".
k8s_ca_conf_directory: "{{ '~/k8s/certs' | expanduser }}"
# etcd version
etcd_version: "3.2.13"
# Port where etcd listening for clients
etcd_client_port: "2379"
# Port where etcd is listening for it's peer's
etcd_peer_port: "2380"
# Interface to bind etcd ports to
etcd_interface: "tap0"
# Directroy for etcd configuration
etcd_conf_dir: "/etc/etcd"
# Directory to store downloaded etcd archive
# Should not be deleted to avoid downloading over and over again
etcd_download_dir: "/opt/etcd"
# Directroy to store etcd binaries
etcd_bin_dir: "/usr/local/bin"
# etcd data directory (etcd database files so to say)
etcd_data_dir: "/var/lib/etcd"
# etcd flags/settings. This parameters are directly passed to "etcd" daemon during startup.
# To see all possible settings/flags either run "etcd --help" or have a look at the
# documentation. The dictionary keys below are just the flag names without "--". E.g.
# the first "name" flag below will be passed as "--name=whatever-hostname" to "etcd"
# daemon.
etcd_settings:
"name": "{{ansible_hostname}}"
"cert-file": "{{etcd_conf_dir}}/cert-etcd.pem"
"key-file": "{{etcd_conf_dir}}/cert-etcd-key.pem"
"peer-cert-file": "{{etcd_conf_dir}}/cert-etcd.pem"
"peer-key-file": "{{etcd_conf_dir}}/cert-etcd-key.pem"
"peer-trusted-ca-file": "{{etcd_conf_dir}}/ca-etcd.pem"
"peer-client-cert-auth": "true" # # Enable peer client cert authentication
"client-cert-auth": "true" # Enable client cert authentication
"trusted-ca-file": "{{etcd_conf_dir}}/ca-etcd.pem"
"advertise-client-urls": "{{'https://' + hostvars[inventory_hostname]['ansible_' + etcd_interface].ipv4.address + ':' + etcd_client_port}}"
"initial-advertise-peer-urls": "{{'https://' + hostvars[inventory_hostname]['ansible_' + etcd_interface].ipv4.address + ':' + etcd_peer_port}}"
"listen-peer-urls": "{{'https://' + hostvars[inventory_hostname]['ansible_' + etcd_interface].ipv4.address + ':' + etcd_peer_port}}"
"listen-client-urls": "{{'https://' + hostvars[inventory_hostname]['ansible_' + etcd_interface].ipv4.address + ':' + etcd_client_port + ',https://127.0.0.1:' + etcd_client_port}}"
"initial-cluster-token": "etcd-cluster-0" # Initial cluster token for the etcd cluster during bootstrap.
"initial-cluster-state": "new" # Initial cluster state ('new' or 'existing')
"data-dir": "{{etcd_data_dir}}" # etcd data directory (etcd database files so to say)
"wal-dir": "" # Dedicated wal directory ("" means no seperated WAL directory)
"auto-compaction-retention": "0" # Auto compaction retention in hour. 0 means disable auto compaction.
"snapshot-count": "100000" # Number of committed transactions to trigger a snapshot to disk
"heartbeat-interval": "100" # Time (in milliseconds) of a heartbeat interval
"election-timeout": "1000" # Time (in milliseconds) for an election to timeout. See tuning documentation for details
"max-snapshots": "5" # Maximum number of snapshot files to retain (0 is unlimited)
"max-wals": "5" # Maximum number of wal files to retain (0 is unlimited)
"cors": "" # Comma-separated whitelist of origins for CORS (cross-origin resource sharing)
"quota-backend-bytes": "0" # Raise alarms when backend size exceeds the given quota (0 defaults to low space quota)
"log-package-levels": "" # Specify a particular log level for each etcd package (eg: 'etcdmain=CRITICAL,etcdserver=DEBUG')
"log-output": "default" # Specify 'stdout' or 'stderr' to skip journald logging even when running under systemd
# Certificate authority and certificate files for etcd
etcd_certificates:
- ca-etcd.pem # client server TLS trusted CA key file/peer server TLS trusted CA file
- ca-etcd-key.pem # CA key file
- cert-etcd.pem # peer server TLS cert file
- cert-etcd-key.pem # peer server TLS key file
```
The etcd default settings defined in `etcd_settings` can be overriden by defining a variable called `etcd_settings_user`. You can also add additional settings by using this variable. E.g. to override the default value for `log-output` seting and add a new setting like `grpc-keepalive-min-time` add the following settings to `group_vars/k8s.yml`:
```
etcd_settings_user:
"log-output": "stdout"
"grpc-keepalive-min-time": "10s"
```
Example Playbook
----------------
```
- hosts: k8s_etcd
roles:
- githubixx.etcd
```
License
-------
GNU GENERAL PUBLIC LICENSE Version 3
Author Information
------------------
[http://www.tauceti.blog](http://www.tauceti.blog)

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@ -1,60 +1,13 @@
--- etcd_name: "etcd_{{ ansible_hostname }}"
# The directory from where to copy the K8s certificates. By default this #etcd_advertise_client_urls: "http://{{ ansible_hostname }}:2379"
# will expand to user's LOCAL $HOME (the user that run's "ansible-playbook ..." etcd_advertise_client_urls: "http://{{ vpn_ip }}:2379"
# plus "/k8s/certs". That means if the user's $HOME directory is e.g. #etcd_listen_client_urls: 'http://{{ ansible_hostname }}:2379,http://127.0.0.1:2379'
# "/home/da_user" then "k8s_ca_conf_directory" will have a value of etcd_listen_client_urls: 'http://{{ vpn_ip }}:2379,http://127.0.0.1:2379'
# "/home/da_user/k8s/certs". #etcd_initial_advertise_peer_urls: "http://{{ ansible_hostname }}:2380"
k8s_ca_conf_directory: "{{ '~/k8s/certs' | expanduser }}" etcd_initial_advertise_peer_urls: "http://{{ vpn_ip }}:2380"
#etcd_listen_peer_urls: "http://{{ ansible_hostname }}:2380"
# etcd version etcd_listen_peer_urls: "http://{{ vpn_ip }}:2380"
etcd_version: "3.2.13" # Create the list of initial cluster by using a template lookup
# Port where etcd listening for clients etcd_initial_cluster: "{{ lookup('template', 'templates/initial_cluster.j2') | replace('\n', '')}}"
etcd_client_port: "2379" etcd_initial_cluster_token: "token_{{ hostvars[initial_master]['ansible_hostname'] }}"
# Port where etcd is listening for it's peer's etcd_initial_cluster_state: "new"
etcd_peer_port: "2380"
# Interface to bind etcd ports to
etcd_interface: "tap0"
# Directroy for etcd configuration
etcd_conf_dir: "/etc/etcd"
# Directory to store downloaded etcd archive
# Should not be deleted to avoid downloading over and over again
etcd_download_dir: "/opt/etcd"
# Directroy to store etcd binaries
etcd_bin_dir: "/usr/local/bin"
# etcd data directory (etcd database files so to say)
etcd_data_dir: "/var/lib/etcd"
etcd_settings:
"name": "{{ansible_hostname}}"
"cert-file": "{{etcd_conf_dir}}/etcd.pem"
"key-file": "{{etcd_conf_dir}}/etcd-key.pem"
"peer-cert-file": "{{etcd_conf_dir}}/etcd.pem"
"peer-key-file": "{{etcd_conf_dir}}/etcd-key.pem"
"peer-trusted-ca-file": "{{etcd_conf_dir}}/ca.pem"
"peer-client-cert-auth": "true" # # Enable peer client cert authentication
"client-cert-auth": "true" # Enable client cert authentication
"trusted-ca-file": "{{etcd_conf_dir}}/ca.pem"
"advertise-client-urls": "{{'https://' + hostvars[inventory_hostname]['ansible_' + etcd_interface].ipv4.address + ':' + etcd_client_port}}"
"initial-advertise-peer-urls": "{{'https://' + hostvars[inventory_hostname]['ansible_' + etcd_interface].ipv4.address + ':' + etcd_peer_port}}"
"listen-peer-urls": "{{'https://' + hostvars[inventory_hostname]['ansible_' + etcd_interface].ipv4.address + ':' + etcd_peer_port}}"
"listen-client-urls": "{{'https://' + hostvars[inventory_hostname]['ansible_' + etcd_interface].ipv4.address + ':' + etcd_client_port + ',https://127.0.0.1:' + etcd_client_port}}"
"initial-cluster-token": "etcd-cluster-0" # Initial cluster token for the etcd cluster during bootstrap.
"initial-cluster-state": "new" # Initial cluster state ('new' or 'existing')
"data-dir": "{{etcd_data_dir}}" # etcd data directory (etcd database files so to say)
"wal-dir": "" # Dedicated wal directory ("" means no seperated WAL directory)
"auto-compaction-retention": "0" # Auto compaction retention in hour. 0 means disable auto compaction.
"snapshot-count": "100000" # Number of committed transactions to trigger a snapshot to disk
"heartbeat-interval": "100" # Time (in milliseconds) of a heartbeat interval
"election-timeout": "1000" # Time (in milliseconds) for an election to timeout. See tuning documentation for details
"max-snapshots": "5" # Maximum number of snapshot files to retain (0 is unlimited)
"max-wals": "5" # Maximum number of wal files to retain (0 is unlimited)
"cors": "" # Comma-separated whitelist of origins for CORS (cross-origin resource sharing)
"quota-backend-bytes": "0" # Raise alarms when backend size exceeds the given quota (0 defaults to low space quota)
"log-package-levels": "" # Specify a particular log level for each etcd package (eg: 'etcdmain=CRITICAL,etcdserver=DEBUG')
"log-output": "default" # Specify 'stdout' or 'stderr' to skip journald logging even when running under systemd
# Certificate authority and certificate files for etcd
etcd_certificates:
- ca.pem # client server TLS trusted CA key file/peer server TLS trusted CA file
- etcd.pem # peer server TLS cert file
- etcd-key.pem # peer server TLS key file

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@ -1,3 +0,0 @@
---
- name: reload systemd
command: systemctl daemon-reload

13
roles/etcd/meta/main.yml
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@ -1,13 +0,0 @@
galaxy_info:
author: Robert Wimmer
description: Installs etcd cluster.
license: GPLv3
min_ansible_version: 2.2
platforms:
- name: Ubuntu
versions:
- xenial
galaxy_tags:
- etcd
- ha
- kv

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@ -1,104 +1,42 @@
--- ---
- name: Create etcd config directory - name: etcd replicated and outiside of kubeadm when multimasters
file: block:
path: "{{etcd_conf_dir}}"
state: directory
tags:
- etcd
- name: Create etcd download directory - name: Install python3-pip
file: apt:
path: "{{etcd_download_dir}}" name: python3-pip
state: directory state: latest
tags: register: result
- etcd retries: 3
until: result is success
- name: Create etcd bin directory - name: Install docker-compose
file: pip:
path: "{{etcd_bin_dir}}" name: docker-compose
state: directory
tags:
- etcd
- name: Create etcd data directory - name: Running etcd container on masters nodes
file: docker_container:
path: "{{etcd_data_dir}}" name: etcd
state: directory image: "quay.io/coreos/etcd:v{{etcd_version}}"
tags: state: started
- etcd detach: True
ports:
- "0.0.0.0:2380:2380"
- "0.0.0.0:2379:2379"
command: [
"etcd",
"--name {{ etcd_name }}",
"--initial-advertise-peer-urls {{ etcd_initial_advertise_peer_urls }}",
"--listen-peer-urls {{ etcd_listen_peer_urls }}",
"--advertise-client-urls {{ etcd_advertise_client_urls }}",
"--listen-client-urls {{ etcd_listen_client_urls }}",
"--initial-cluster {{ etcd_initial_cluster }}",
"--initial-cluster-state {{ etcd_initial_cluster_state }}",
"--initial-cluster-token {{ etcd_initial_cluster_token }}"
]
network_mode: host
restart_policy: always
- name: Copy certificates when:
copy: - groups.k8s_masters|length > 1
src: "{{k8s_ca_conf_directory}}/{{item}}"
dest: "{{etcd_conf_dir}}/{{item}}"
mode: 0640
owner: root
group: root
with_items:
- "{{etcd_certificates}}"
tags:
- etcd
- name: Downloading official etcd release
get_url:
url: https://github.com/coreos/etcd/releases/download/v{{etcd_version}}/etcd-v{{etcd_version}}-linux-amd64.tar.gz
dest: "{{etcd_download_dir}}/etcd-v{{etcd_version}}-linux-amd64.tar.gz"
mode: 0755
tags:
- etcd
- name: Unzip downloaded file
unarchive:
src: "{{etcd_download_dir}}/etcd-v{{etcd_version}}-linux-amd64.tar.gz"
dest: "{{etcd_download_dir}}/"
remote_src: yes
owner: "root"
group: "root"
creates: "{{etcd_download_dir}}/etcd-v{{etcd_version}}-linux-amd64/etcd"
tags:
- etcd
- name: Copy etcd binaries to destination directory
copy:
src: "{{etcd_download_dir}}/etcd-v{{etcd_version}}-linux-amd64/{{item}}"
dest: "{{etcd_bin_dir}}/{{item}}"
mode: 0755
owner: root
group: root
remote_src: yes
with_items:
- etcd
- etcdctl
tags:
- etcd
- name: Combine etcd_settings and etcd_settings_user (if defined)
set_fact:
etcd_settings: "{{etcd_settings | combine(etcd_settings_user|default({})) }}"
tags:
- etcd
- etcd-systemd
- name: Create systemd unit file
template:
src: etc/systemd/system/etcd.service.j2
dest: /etc/systemd/system/etcd.service
owner: root
group: root
mode: 0644
notify:
- reload systemd
tags:
- etcd
- etcd-systemd
- meta: flush_handlers
- name: Enable and start etcd
service:
name: etcd
enabled: yes
state: started
tags:
- etcd

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@ -1,24 +0,0 @@
#jinja2: trim_blocks:False
{%- macro cluster_hosts() -%}
{%- for host in groups['k8s_etcd'] -%}
{{hostvars[host]['ansible_hostname']}}=https://{{hostvars[host]['ansible_' + etcd_interface].ipv4.address}}:{{etcd_peer_port}}{% if not loop.last %},{% endif %}
{%- endfor -%}
{%- endmacro -%}
{%- set x=etcd_settings.__setitem__('initial-cluster',cluster_hosts()) -%}
[Unit]
Description=etcd
Documentation=https://github.com/coreos
[Service]
ExecStart={{etcd_bin_dir}}/etcd \
{%- for setting in etcd_settings|sort %}
--{{setting}}="{{etcd_settings[setting]}}" {% if not loop.last %}\{% endif %}
{%- endfor %}
Restart=on-failure
RestartSec=5
Type=notify
[Install]
WantedBy=multi-user.target

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@ -0,0 +1 @@
{% for svrs in ['k8s_masters'] %}{% for host in groups[svrs] %}etcd_{{ hostvars[host].ansible_hostname }}=http://{{ hostvars[host].vpn_ip }}:2380{% if not loop.last %},{% endif %}{% endfor %}{% endfor %}

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@ -1 +0,0 @@
localhost

5
roles/etcd/tests/test.yml
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@ -1,5 +0,0 @@
---
- hosts: localhost
remote_user: root
roles:
- .

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@ -1 +0,0 @@
---