Add check cron mode

README.md

@@ -4,8 +4,8 @@ Monitoring plugin to check if containers are upgradable. By default all running
 
 Checks are done by running Icinga/Nagios compatible check plugins inside containers. These plugins are listed inside the `CHECK_PLUGINS` associative array (on top of the file) and by default, the following plugin are declared:
 
-- `/usr/lib/nagios/plugins/check_apt`: for Debian based image, provide by the `monitoring-plugins-basic` debian package
+-   `/usr/lib/nagios/plugins/check_apt`: for Debian based image, provide by the `monitoring-plugins-basic` debian package
-- `/usr/lib/nagios/plugins/check_apk`: for Alpine based image, see [project](https://gitea.zionetrix.net/bn8/check_apk) for install instructions
+-   `/usr/lib/nagios/plugins/check_apk`: for Alpine based image, see [project](https://gitea.zionetrix.net/bn8/check_apk) for install instructions
 
 **Note:** The first plugin detected as installed will be used.
 
@@ -39,6 +39,8 @@ Usage : check_container_upgrade [-d] [-E /path/to/engine] [container1,...]
                             rebuilt on status file.
     --deploy-cron           Start in deploy cron mode: deploy containers known as rebuilt in status
                             file.
+    --check-cron            Start in check cron node: check if containers need to be updated and
+                            trigger their rebuild.
     -d                      Debug mode
     -l                      Log file
     -C                      Console logging (even if log file is specify)

check_container_upgrade

@@ -19,6 +19,7 @@ REBUILD=0
 REBUILD_DATA_DIR="/var/log/$(basename "$0")"
 REBUILD_CRON=0
 DEPLOY_CRON=0
+CHECK_CRON=0
 declare -rA CHECK_PLUGINS=(
     ["/usr/lib/nagios/plugins/check_apt"]="/usr/lib/nagios/plugins/check_apt -u -U -t 60 -l"
     ["/usr/lib/nagios/plugins/check_apk"]="/usr/lib/nagios/plugins/check_apk"
@@ -161,6 +162,8 @@ Usage : $(basename "$0") [-d] [-E /path/to/engine] [container1,...]
                             rebuilt on status file.
     --deploy-cron           Start in deploy cron mode: deploy containers known as rebuilt in status
                             file.
+    --check-cron            Start in check cron node: check if containers need to be updated and
+                            trigger their rebuild.
     -d                      Debug mode
     -l                      Log file
     -C                      Console logging (even if log file is specify)
@@ -223,6 +226,9 @@ while [[ $idx -le $# ]]; do
         --deploy-cron)
             DEPLOY_CRON=1
         ;;
+        --check-cron)
+            CHECK_CRON=1
+        ;;
         *)
             ONLY_CONTAINERS+=( "$OPT" )
         ;;
@@ -448,33 +454,35 @@ debug "Upgradable containers (${#UPGRADABLE_CONTAINERS[@]}): $( implode ", " "${
 debug "Containers with errors (${#ERRORS[@]}): $( implode ", " "${!ERRORS[@]}" )"
 debug "Not found containers (${#NOTFOUNDS[@]}): $( implode ", " "${NOTFOUNDS[@]}" )"
 
-# Compute performance data
+if [[ $CHECK_CRON -eq 0 ]]; then
-(( CONTAINER_COUNTS=${#CHECKED_CONTAINERS[@]}+${#NOTFOUNDS[@]} ))
+    # Compute performance data
-PERF_DATA=(
+    (( CONTAINER_COUNTS=${#CHECKED_CONTAINERS[@]}+${#NOTFOUNDS[@]} ))
-    "uptodate_containers=${#UP_TO_DATE[@]};;;0;$CONTAINER_COUNTS"
+    PERF_DATA=(
-    "upgradable_containers=${#UPGRADABLE_CONTAINERS[@]};;;0;$CONTAINER_COUNTS"
+        "uptodate_containers=${#UP_TO_DATE[@]};;;0;$CONTAINER_COUNTS"
-    "containers_with_errors=${#ERRORS[@]};1;;0;$CONTAINER_COUNTS"
+        "upgradable_containers=${#UPGRADABLE_CONTAINERS[@]};;;0;$CONTAINER_COUNTS"
-    "unknown_state_containers=${#UNKNOWNS[@]};;;0;$CONTAINER_COUNTS"
+        "containers_with_errors=${#ERRORS[@]};1;;0;$CONTAINER_COUNTS"
-)
+        "unknown_state_containers=${#UNKNOWNS[@]};;;0;$CONTAINER_COUNTS"
+    )
 
-# Compute performance data as string
+    # Compute performance data as string
-PERF_DATA_TXT="$( implode " " "${PERF_DATA[@]}" )"
+    PERF_DATA_TXT="$( implode " " "${PERF_DATA[@]}" )"
 
-# Display check result message
+    # Display check result message
-case $EXIT_CODE in
+    case $EXIT_CODE in
-    0)
+        0)
-        message "OK - All ${#UP_TO_DATE[@]} container(s) are up-to-date |$PERF_DATA_TXT"
+            message "OK - All ${#UP_TO_DATE[@]} container(s) are up-to-date |$PERF_DATA_TXT"
-        ;;
+            ;;
-    1)
+        1)
-        message "WARNING - ${#ERRORS[@]} container(s) need to be updated |$PERF_DATA_TXT"
+            message "WARNING - ${#ERRORS[@]} container(s) need to be updated |$PERF_DATA_TXT"
-        ;;
+            ;;
-    2)
+        2)
-        message "CRITICAL - ${#ERRORS[@]} container(s) need to be updated |$PERF_DATA_TXT"
+            message "CRITICAL - ${#ERRORS[@]} container(s) need to be updated |$PERF_DATA_TXT"
-        ;;
+            ;;
-    *)
+        *)
-        message "UNKNOWN - fail to retrieve status of ${#UNKNOWNS[@]} container(s) |$PERF_DATA_TXT"
+            message "UNKNOWN - fail to retrieve status of ${#UNKNOWNS[@]} container(s) |$PERF_DATA_TXT"
-        ;;
+            ;;
-esac
+    esac
+fi
 
 # Trigger container build (if need, enabled and docker compose file is provided)
 if [[ $REBUILD -eq 1 ]]; then
@@ -544,7 +552,7 @@ if [[ $REBUILD -eq 1 ]]; then
         done
 
         # Handle rebuilt containers
-        if [[ ${#REBUILT_CONTAINERS[@]} -gt 0 ]]; then
+        if [[ ${#REBUILT_CONTAINERS[@]} -gt 0 ]] && [[ $CHECK_CRON -eq 0 ]]; then
             message
             message "Some containers are ready to be recreated and restarted."
             message "Run the following command to do it:"
@@ -560,9 +568,11 @@ for container in "${!ERRORS[@]}"; do
     message "${container}" - "${ERRORS[${container}]}"
 done
 
-for container in "${!UP_TO_DATE[@]}"; do
+if [[ $CHECK_CRON -eq 0 ]]; then
-    message "${container}" - "${UP_TO_DATE[${container}]}"
+    for container in "${!UP_TO_DATE[@]}"; do
-done
+        message "${container}" - "${UP_TO_DATE[${container}]}"
+    done
+fi
 
 exit $EXIT_CODE