Add cron schedule to monitor deployment playbook (#161)

* Default cron schedule

* Added cron task

* Docs

* Overwriting log files

* Removed deprecated flag

* Default monitor_cron_schedule.

deployment/CONFIGURATION.md

@@ -47,6 +47,7 @@ cp hosts.yml.example hosts.yml
         <host_ip_B>:
           ansible_user: <user>
           #syslog_server_port: "<protocol>://<ip>:<port>"
+          #monitor_cron_schedule: "*/4 * * * *" # When this parameter is set, it will overwrite default schedule for performing checks
 ```
 
 The config above would install the Oracle on `<host_ip_A>`, UI on `<host_ip_C>`, and both Oracle, UI and Monitor on `<host_ip_B>`.

deployment/group_vars/dai.yml

@@ -51,4 +51,3 @@ MONITOR_FOREIGN_GAS_LIMIT: 300000
 MONITOR_HOME_GAS_PRICE_FALLBACK: 0
 MONITOR_FOREIGN_GAS_PRICE_FALLBACK: 10000000000
 MONITOR_LEFT_TX_THRESHOLD: 100
-MONITOR_CRON_SCHEDULE: "* * * * *"

deployment/group_vars/example.yml

@@ -52,4 +52,3 @@ MONITOR_FOREIGN_GAS_LIMIT: 300000
 MONITOR_HOME_GAS_PRICE_FALLBACK: 1000000000
 MONITOR_FOREIGN_GAS_PRICE_FALLBACK: 1000000000
 MONITOR_LEFT_TX_THRESHOLD: 100
-MONITOR_CRON_SCHEDULE: "* * * * *"

deployment/group_vars/wetc.yml

@@ -52,4 +52,3 @@ MONITOR_FOREIGN_GAS_LIMIT: 300000
 MONITOR_HOME_GAS_PRICE_FALLBACK: 15000000000
 MONITOR_FOREIGN_GAS_PRICE_FALLBACK: 10000000000
 MONITOR_LEFT_TX_THRESHOLD: 100
-MONITOR_CRON_SCHEDULE: "* * * * *"

deployment/hosts.yml.example

@@ -17,3 +17,4 @@ sokol-kovan:
         127.0.0.1:
           ansible_user: ubuntu
           #syslog_server_port: "<protocol>://<ip>:<port>"
+          #monitor_cron_schedule: "*/4 * * * *"

deployment/roles/monitor/defaults/main.yml

@@ -0,0 +1,2 @@
+---
+monitor_cron_schedule: "*/4 * * * *"

deployment/roles/monitor/tasks/cron.yml

@@ -0,0 +1,18 @@
+---
+- name: Parse cron schedule
+  set_fact:
+    minute: "{{ monitor_cron_schedule.split(' ')[0] }}"
+    hour: "{{ monitor_cron_schedule.split(' ')[1] }}"
+    day: "{{ monitor_cron_schedule.split(' ')[2] }}"
+    month: "{{ monitor_cron_schedule.split(' ')[3] }}"
+    weekday: "{{ monitor_cron_schedule.split(' ')[4] }}"
+    job: "/bin/bash -c 'cd {{ bridge_path }}/monitor/scripts; ./checkDocker.sh >cronWorker.out 2>cronWorker.err'"
+- name: Add cron entry
+  cron:
+    name: "RUN_MONITOR_CHECKS"
+    minute: "{{ minute }}"
+    hour: "{{ hour }}"
+    day: "{{ day }}"
+    month: "{{ month }}"
+    weekday: "{{ weekday }}"
+    job: "{{ job }}"

deployment/roles/monitor/tasks/main.yml

@@ -3,3 +3,4 @@
 - include_tasks: logging.yml
 - include_tasks: jumpbox.yml
 - include_tasks: servinstall.yml
+- include_tasks: cron.yml

deployment/roles/monitor/templates/.env.j2

@@ -22,4 +22,3 @@ FOREIGN_GAS_PRICE_FALLBACK={{ MONITOR_FOREIGN_GAS_PRICE_FALLBACK }}
 FOREIGN_GAS_PRICE_FACTOR={{ FOREIGN_GAS_PRICE_FACTOR }}
 LEFT_TX_THRESHOLD={{ MONITOR_LEFT_TX_THRESHOLD }}
 PORT={{ MONITOR_PORT }}
-CRON_SCHEDULE={{ MONITOR_CRON_SCHEDULE }}

monitor/scripts/checkDocker.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+cd $(dirname $0)/..
+
+if /usr/local/bin/docker-compose ps | grep -q -i 'monitor'; then
+  # https://github.com/docker/compose/issues/3352
+  COMPOSE_INTERACTIVE_NO_CLI=1 /usr/local/bin/docker-compose exec -T monitor /bin/bash -c 'yarn check-all'
+else
+  echo "Monitor is not running, skipping checks."
+fi