From 442a85135e71778764819a2934396136ee862b02 Mon Sep 17 00:00:00 2001
From: Kevin Veen-Birkenbach <kevin@veen.world>
Date: Sun, 25 Dec 2022 13:40:38 +0100
Subject: [PATCH] Implemented docker health check

---
 .../files/docker-health-check.service         |  7 ++++++
 .../files/docker-health-check.sh              | 10 +++++++++
 .../files/docker-health-check.timer           |  8 +++++++
 .../handlers/main.yml                         | 12 ++++++++++
 .../native-docker-health-check/meta/main.yml  |  2 ++
 .../native-docker-health-check/tasks/main.yml | 22 +++++++++++++++++++
 roles/native-docker/meta/main.yml             |  1 +
 7 files changed, 62 insertions(+)
 create mode 100644 roles/native-docker-health-check/files/docker-health-check.service
 create mode 100644 roles/native-docker-health-check/files/docker-health-check.sh
 create mode 100644 roles/native-docker-health-check/files/docker-health-check.timer
 create mode 100644 roles/native-docker-health-check/handlers/main.yml
 create mode 100644 roles/native-docker-health-check/meta/main.yml
 create mode 100644 roles/native-docker-health-check/tasks/main.yml

diff --git a/roles/native-docker-health-check/files/docker-health-check.service b/roles/native-docker-health-check/files/docker-health-check.service
new file mode 100644
index 00000000..fdb78871
--- /dev/null
+++ b/roles/native-docker-health-check/files/docker-health-check.service
@@ -0,0 +1,7 @@
+[Unit]
+Description=Check docker status
+OnFailure=systemd-email@%n.service
+
+[Service]
+Type=oneshot
+ExecStart=/bin/bash /home/administrator/scripts/docker-health-check/docker-health-check.sh
diff --git a/roles/native-docker-health-check/files/docker-health-check.sh b/roles/native-docker-health-check/files/docker-health-check.sh
new file mode 100644
index 00000000..216f633c
--- /dev/null
+++ b/roles/native-docker-health-check/files/docker-health-check.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+docker_ps_grep_unhealthy="$(docker ps | grep unhealthy)"
+if [ -z "$docker_ps_grep_unhealthy" ]
+then 
+   echo "All docker containers are healthy."
+   exit
+else
+   echo "Some docker containers are unhealthy: $docker_ps_grep_unhealthy"
+   exit 1
+fi
\ No newline at end of file
diff --git a/roles/native-docker-health-check/files/docker-health-check.timer b/roles/native-docker-health-check/files/docker-health-check.timer
new file mode 100644
index 00000000..e3bb3bfb
--- /dev/null
+++ b/roles/native-docker-health-check/files/docker-health-check.timer
@@ -0,0 +1,8 @@
+[Unit]
+Description=starts docker-health-check.service
+
+[Timer]
+OnCalendar=10:00
+
+[Install]
+WantedBy=timers.target
diff --git a/roles/native-docker-health-check/handlers/main.yml b/roles/native-docker-health-check/handlers/main.yml
new file mode 100644
index 00000000..8aec3318
--- /dev/null
+++ b/roles/native-docker-health-check/handlers/main.yml
@@ -0,0 +1,12 @@
+- name: "restart docker-health-check.service"
+  systemd:
+    name: docker-health-check.service
+    state: restarted
+    enabled: yes
+    daemon_reload: yes
+- name: "restart docker-health-check.timer"
+  systemd:
+    name: docker-health-check.timer
+    state: restarted
+    enabled: yes
+    daemon_reload: yes
diff --git a/roles/native-docker-health-check/meta/main.yml b/roles/native-docker-health-check/meta/main.yml
new file mode 100644
index 00000000..9d9d34e2
--- /dev/null
+++ b/roles/native-docker-health-check/meta/main.yml
@@ -0,0 +1,2 @@
+dependencies:
+  - native-systemd-email
diff --git a/roles/native-docker-health-check/tasks/main.yml b/roles/native-docker-health-check/tasks/main.yml
new file mode 100644
index 00000000..e2c147f8
--- /dev/null
+++ b/roles/native-docker-health-check/tasks/main.yml
@@ -0,0 +1,22 @@
+- name: "create /home/administrator/scripts/docker-health-check/"
+  file:
+    path: "/home/administrator/scripts/docker-health-check"
+    state: directory
+    mode: 0755
+
+- name: create docker-health-check.sh
+  copy:
+    src: docker-health-check.sh
+    dest: "/home/administrator/scripts/docker-health-check/docker-health-check.sh"
+
+- name: create docker-health-check.service
+  copy:
+    src: docker-health-check.service
+    dest: "/etc/systemd/system/docker-health-check.service"
+  notify: restart docker-health-check.service
+
+- name: create docker-health-check.timer
+  copy:
+    src: docker-health-check.timer
+    dest: "/etc/systemd/system/docker-health-check.timer"
+  notify: restart docker-health-check.timer
diff --git a/roles/native-docker/meta/main.yml b/roles/native-docker/meta/main.yml
index 9a413bd5..a1abc078 100644
--- a/roles/native-docker/meta/main.yml
+++ b/roles/native-docker/meta/main.yml
@@ -1,3 +1,4 @@
 dependencies:
   - native-docker-volume-backup
   - native-user-administrator
+  - native-docker-health-check