patroni-postgresql-cluster (#13)

* Описана инфрастуктура кластера

* Добавлена роль etcd

* Добавлена роль haproxy

* Добавлена роль keepalived

* Добавлена роль ntp_install

* Добавлена роль patroni

* Добавлена групповые переменные

---------

Co-authored-by: Fedor Batonogov <f.batonogov@yandex.ru>

ansible/roles/haproxy/handlers/main.yml

@@ -0,0 +1,8 @@
+---
+# handlers file for haproxy
+- name: Перезапускаю haproxy.service
+  ansible.builtin.systemd:
+    name: haproxy.service
+    state: restarted
+    enabled: true
+    daemon_reload: true

ansible/roles/haproxy/tasks/config.yml

@@ -0,0 +1,13 @@
+---
+- name: Создаю директорию /usr/local/etc/haproxy/
+  ansible.builtin.file:
+    path: /usr/local/etc/haproxy/
+    state: directory
+
+- name: Наливаю haproxy.cfg
+  ansible.builtin.template:
+    src: haproxy.cfg.j2
+    dest: "/usr/local/etc/haproxy/haproxy.cfg"
+    mode: "755"
+  notify:
+    - Перезапускаю haproxy.service

ansible/roles/haproxy/tasks/install.yml

@@ -0,0 +1,13 @@
+---
+- name: Наливаю юнит файл haproxy
+  ansible.builtin.template:
+    src: haproxy.service.j2
+    dest: /etc/systemd/system/haproxy.service
+  notify:
+    - Перезапускаю haproxy.service
+
+- name: Настраиваю haproxy.service
+  ansible.builtin.systemd:
+    name: haproxy.service
+    state: started
+    enabled: true

ansible/roles/haproxy/tasks/main.yml

@@ -0,0 +1,7 @@
+---
+# tasks file for haproxy
+- name: Копирую конфигурацию haproxy
+  ansible.builtin.import_tasks: config.yml
+
+- name: Устанавливаю haproxy
+  ansible.builtin.import_tasks: install.yml

ansible/roles/haproxy/templates/haproxy.cfg.j2

@@ -0,0 +1,36 @@
+global
+    maxconn 100
+
+defaults
+    log    global
+    mode    tcp
+    retries 2
+    timeout client 30m
+    timeout connect 4s
+    timeout server 30m
+    timeout check 5s
+
+listen stats
+    mode http
+    bind *:7000
+    stats enable
+    stats uri /
+
+listen patroni-postgresql-primary
+    bind *:5000
+    option httpchk OPTIONS /master
+    http-check expect status 200
+    default-server inter 3s fall 3 rise 2 on-marked-down shutdown-sessions
+    server 10.0.75.111 10.0.75.111:5432 maxconn 100 check port 8008
+    server 10.0.75.112 10.0.75.112:5432 maxconn 100 check port 8008
+    server 10.0.75.113 10.0.75.113:5432 maxconn 100 check port 8008
+
+listen patroni-postgresql-standbys
+    balance roundrobin
+    bind *:5001
+    option httpchk OPTIONS /replica
+    http-check expect status 200
+    default-server inter 3s fall 3 rise 2 on-marked-down shutdown-sessions
+    server 10.0.75.111 10.0.75.111:5432 maxconn 100 check port 8008
+    server 10.0.75.112 10.0.75.112:5432 maxconn 100 check port 8008
+    server 10.0.75.113 10.0.75.113:5432 maxconn 100 check port 8008

ansible/roles/haproxy/templates/haproxy.service.j2

@@ -0,0 +1,21 @@
+[Unit]
+Description=haproxy
+Requires=docker.service
+After=docker.service
+
+[Service]
+Restart=always
+ExecStartPre=-/usr/bin/docker rm -f haproxy
+ExecStart=/usr/bin/docker run \
+  --rm \
+  --publish 5000:5000 \
+  --publish 5001:5001 \
+  --publish 7000:7000 \
+  --volume /usr/local/etc/haproxy/:/usr/local/etc/haproxy/:ro \
+  --sysctl net.ipv4.ip_unprivileged_port_start=0 \
+  --name haproxy \
+  haproxy:{{ haproxy_version }}
+ExecStop=/usr/bin/docker stop -t 10 haproxy
+
+[Install]
+WantedBy=multi-user.target

ansible/roles/haproxy/vars/main.yml

@@ -0,0 +1,3 @@
+---
+# vars file for haproxy
+haproxy_version: 3.0.2-alpine