update usage

Author: MMA

check_kubernetes.sh

@@ -28,11 +28,13 @@ usage() {
 	                    - Pod restart count in pods mode; default is 30
 	                    - Job failed count in jobs mode; default is 1
 	                    - Pvc storage utilization; default is 80%
+                      - APICERT expiration days for apicert mode; default is 30
 	  -c CRIT          Critical threshold for
 	                    - Pod restart count (in pods mode); default is 150
 	                    - Unbound Persistent Volumes in unboundpvs mode; default is 5
 	                    - Job failed count in jobs mode; default is 2
 	                    - Pvc storage utilization; default is 90%
+                      - APICERT expiration days for apicert mode; default is 15
 	  -M EXIT_CODE     Exit code when resource is missing; default is 2 (CRITICAL)
 	  -h               Show this help and exit
 
@@ -155,16 +157,18 @@ mode_apicert() {
     if [ -z "$APISERVER" ]; then
         die "Apiserver URL should be defined in this mode"
     fi
+    WARN=${WARN:-30}
+    CRIT=${CRIT:-15}
     APICERT=$(echo "$APISERVER" | awk -F "//" '{ print $2 }' | awk -F ":" '{ print $1 }')
     APIPORT=$(echo "$APISERVER" | awk -F "//" '{ print $2 }' | awk -F ":" '{ print $2 }')
-    set ${APIPORT:=443}
+    APIPORT=${APIPORT:=443}
     APICERTDATE=$(echo | openssl s_client -connect "$APICERT":"$APIPORT" 2>/dev/null | openssl x509 -noout -dates | grep notAfter | sed -e 's#notAfter=##')
     a=$(date -d "$APICERTDATE" +%s)
     b=$(date +%s)
     c=$((a-b))
     d=$((c/3600/24))
     echo "APICERT expires in $d days"
-    if [ "$d" -gt "$WARN" ]; then
+    if [ "$d" -gt "$WARN" ]  && [ "$d" -gt "$CRIT" ]; then
         echo "APICERT is OK"
     elif [ "$d" -le "$WARN" ] && [ $d -gt "$CRIT" ]; then
         echo "APICERT is in WARN"