nagios-nrpe: sync Redis check from redis roles

CHANGELOG.md

@@ -75,6 +75,7 @@ The **patch** part changes is incremented if multiple releases happen the same m
 * lxc-php: fix APT keyring path inside containers
 * nagios-nrpe: `check_ssl_local` now has an output that nrpe can understand when it isn't OK
 * nagios-nrpe: remount `/usr` **after** installing the packages
+* nagios-nrpe: sync Redis check from redis roles
 * nginx: set default server directive in default vhost
 * opendkim: update apt cache before install
 * packweb-apache,nagios-nrpe: add missing task and config for PHP 8.2 container

nagios-nrpe/files/plugins/check_redis_instances

@@ -30,11 +30,21 @@ check_server() {
     host=$(config_var "bind" "${conf_file}")
     port=$(config_var "port" "${conf_file}")
     pass=$(config_var "requirepass" "${conf_file}")
+    maxmemory=$(config_var "maxmemory" "${conf_file}")
+    maxmemory_policy=$(config_var "maxmemory-policy" "${conf_file}")
 
     cmd="${check_bin} -H ${host} -p ${port}"
+    # If "requirepass" is set we add the password to the check
     if [ -n "${pass}" ]; then
         cmd="${cmd} -x ${pass}"
     fi
+    # If "maxmemory" is set and "maxmemory-policy" is missing or set to "noeviction"
+    # then we enforce the "maxmemory" limit
+    if [ -n "${maxmemory}" ]; then
+        if [ -z "${maxmemory_policy}" ] || [ "${maxmemory_policy}" = "noeviction" ]; then
+            cmd="${cmd} --total_memory ${maxmemory} --memory_utilization 80,90"
+        fi
+    fi
     result=$($cmd)
     ret="${?}"
     if [ "${ret}" -ge 2 ]; then
@@ -54,7 +64,7 @@ check_server() {
 config_var() {
     variable=$1
     file=$2
-    test -f $file && grep -E "^${variable}\s+.+$" $file | awk '{ print $2 }'
+    test -f "${file}" && grep -E "^${variable}\s+.+$" "${file}" | awk '{ print $2 }' | sed -e "s/^[\"']//" -e "s/[\"']$//"
 }
 
 # default instance
@@ -63,11 +73,11 @@ if systemctl is-enabled -q redis-server; then
 fi
 
 # additional instances
-conf_files=$(ls -1 /etc/redis-*/redis.conf)
+conf_files=$(ls -1 /etc/redis-*/redis.conf 2> /dev/null)
 for conf_file in ${conf_files}; do
-    name=$(dirname ${conf_file} | sed '{s|/etc/redis-||}')
+    name=$(dirname "${conf_file}" | sed '{s|/etc/redis-||}')
     if systemctl is-enabled -q "redis-server@${name}.service"; then
-        check_server $name $conf_file
+        check_server "${name}" "${conf_file}"
     else
         nb_unchk=$((nb_unchk + 1))
         output="${output}UNCHK - ${name} (unit is disabled or missing)\n"