CI / CD Docker container monitoring

Display the resource consumption status of the running container

$ docker stats --no-stream
CONTAINER ID        NAME                CPU %               MEM USAGE / LIMIT     MEM %               NET I/O             BLOCK I/O           PIDS
a5ed2facaadd        webcentos           0.00%               2.398MiB / 12.37GiB   0.02%               1.31kB / 0B         0B / 0B             2
e3a96695d263        docker_mysql_1      0.12%               187.5MiB / 12.37GiB   1.48%               1.05kB / 0B         0B / 0B             27
cc761f675b3b        docker_nginx_1      0.00%               4.309MiB / 12.37GiB   0.03%               956B / 0B           0B / 0B             2

Format and display

$ docker stats --no-stream --format "{{.Name}},{{.MemPerc}},{{.CPUPerc}}"   #Container name,Memory usage,CPU usage
webcentos,0.02%,0.00%
docker_mysql_1,1.48%,0.12%
docker_nginx_1,0.03%,0.00%

Monitoring batch

Run every minute and skip notification message when usage threshold (80%) is exceeded

#!/bin/bash

#Threshold(%)
LIMIT=90

#Get STATS for container
CHECK_STATS=$(docker stats --no-stream --format "{{.Name}},{{.MemPerc}},{{.CPUPerc}}") #Container name,Memory usage,CPU usage

while read row; do
  name=`echo ${row} | cut -d , -f 1`     #Container name
  memPer=`echo ${row} | cut -d , -f 2`   #Memory usage
  memPer_i=`echo ${memPer%%.*}`
  cpuPer=`echo ${row} | cut -d , -f 3`   #CPU usage
  cpuPer_i=`echo ${cpuPer%%.*}`
  
  #Memory usage threshold check
  if [ $memPer_i -ge $LIMIT ]; then
     message="Container：${name} Memory alert ${memPer}"
     curl -X POST --data-urlencode 'payload={"channel": "#alert", "username": "admin", "text": "${message}"}' <webhook URL>
  fi

  #CPU usage threshold check
  if [ $cpuPer_i -ge $LIMIT ]; then
     message="Container：${name} CPU alert ${cpuPer}"
     curl -X POST --data-urlencode 'payload={"channel": "#alert", "username": "admin", "text": "${message}"}' <webhook URL>
  fi
done < echo "$CHECK_STATS"