Added shared memory check

inventory/group_vars/prod.yml

@@ -96,6 +96,7 @@ need_soft:
   - zoxide
   - logrotate
   - cron
+  - lynx
 smtp_host:
 smtp_port:
 smtp_user:

roles/node_exporter_install/files/collect-shm-metrics.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+OUTPUT="/var/lib/node_exporter/textfile_collector/shm_usage.prom"
+TMP=$(mktemp)
+
+echo "# HELP container_shm_usage_bytes Shared memory usage in bytes" > $TMP
+echo "# TYPE container_shm_usage_bytes gauge" >> $TMP
+echo "# HELP container_shm_size_bytes Shared memory total size in bytes" >> $TMP
+echo "# TYPE container_shm_size_bytes gauge" >> $TMP
+
+while IFS= read -r line; do
+    pid=$(echo "$line" | awk '{print $1}')
+    container=$(echo "$line" | awk '{print $2}' | tr -d '/')
+
+    if [ "$pid" = "0" ] || [ -z "$pid" ]; then continue; fi
+
+    df_out=$(nsenter -t "$pid" -m df -B1 /dev/shm 2>/dev/null | tail -1)
+    total=$(echo "$df_out" | awk '{print $2}')
+    used=$(echo "$df_out" | awk '{print $3}')
+
+    if [ -n "$used" ] && [ -n "$total" ]; then
+        echo "container_shm_usage_bytes{name=\"$container\"} $used" >> $TMP
+        echo "container_shm_size_bytes{name=\"$container\"} $total" >> $TMP
+    fi
+done < <(docker ps -q | xargs docker inspect --format '{{.State.Pid}} {{.Name}}' 2>/dev/null)
+
+mv $TMP $OUTPUT
+chmod 644 $OUTPUT

roles/node_exporter_install/tasks/main.yml

@@ -20,8 +20,7 @@
     dest: "{{ node_exporter_install_node_exporter_bin_path }}"
     mode: '0755'
     remote_src: true
-  when:
+  when: node_exporter_download_check is changed or node_exporter_version_check.stdout | length == 0
-    - node_exporter_download_check is changed or node_exporter_version_check.stdout | length == 0
   ignore_errors: "{{ ansible_check_mode }}"
 
 - name: Create node_exporter group (optional fixed GID)
@@ -73,6 +72,23 @@
     user: root
   when: inventory_hostname is match("^PTAF")
 
+- name: Copy script shared memory check
+  ansible.builtin.copy:
+    src: files/collect-shm-metrics.sh
+    dest: /usr/local/bin/collect-shm-metrics.sh
+    owner: root
+    group: root
+    mode: '0744'
+  when: inventory_hostname is match("^PTAF")
+
+- name: Create cron job for shared memory check
+  ansible.builtin.cron:
+    name: "Collect Docker shared memory check"
+    minute: "*/1"
+    job: "/usr/local/bin/collect-shm-metrics.sh"
+    user: root
+  when: inventory_hostname is match("^PTAF")
+
 - name: Copy script for docker CPU check
   ansible.builtin.copy:
     src: files/docker-cpu-metrics.sh