Docker: not found when running cmds in jenkinsfile - docker

Question

I am new to docker and CI. I am trying to create a jenkinsfile that would build and test my application, then build a docker image with the Dockerfile i've composed and then push it into AWS ECR. The steps I am stuck on is building an image with docker, i receive and error message docker: not found. I downloaded docker plug-in and configured it in the global tool configuration tab. Am i not adding it into tools correctly?
There was another post wear you could use kubernetes to do that however kubernetes no longer supports docker.
image of how i configured docker in global tools config:
global tool config
error
/var/jenkins_home/workspace/client-pipeline_feature-jenkins#tmp/durable-41220eb0/script.sh: 1: /var/jenkins_home/workspace/client-pipeline_feature-jenkins#tmp/durable-41220eb0/script.sh: docker: not found
error with permission to sock
def gv
containerVersion = "1.0"
appName = "foodcore"
imageName = appName + ":" + version
pipeline {
agent any
environment {
CI = 'true'
}
tools {
nodejs "node"
docker "docker"
}
stages {
stage("init") {
steps {
script {
gv = load "script.groovy"
CODE_CHANGES = gv.getGitChanges()
}
}
}
stage("build frontend") {
steps {
dir("client") {
sh 'npm install'
}
}
}
stage("build backend") {
steps {
dir("server") {
sh 'npm install'
}
}
}
stage("test") {
when {
expression {
script {
CODE_CHANGES == false
}
}
}
steps {
dir("client") {
sh 'npm test'
}
}
}
stage("build docker image") {
when {
expression {
script {
env.BRANCH_NAME.toString().equals('Main') && CODE_CHANGES == false
}
}
}
steps {
sh "docker build -t ${imageName} ."
}
}
stage("push docker image") {
when {
expression {
env.BRANCH_NAME.toString().equals('Main')
}
}
steps {
sh 'aws ecr get-login-password --region us-east-2 | docker login --username AWS --password-stdin repoURI'
sh 'docker tag foodcore:latest ...repoURI
sh 'docker push repoURI'
}
}
}
}

Answer 1

Use echo hello world to make...

Answer 2

Docker should be installed on the server Jenkins is running. The docker plugin provided by Jenkins is just like a tool to generate some snippets for the pipeline scripts. Installing and configuring the tool doesn't install a docker daemon. Please check if docker is installed on the OS or not.

Answer 3

As we can see in the thread, you are start getting permission denied on docker.sock.
docker.sock permissions will be lost if you restart system or docker service.
To make it persistence setup a cron to change ownership after each reboot
#reboot chmod 777 /var/run/docker.sock
and When you restart the docker, make sure to run the below command
chmod 777 /var/run/docker.sock
Or you can put a cron for it also, which will execute in each every 5 minutes.

Answer 4

To use docker inside Jenkins build, There are 2 methods.
Use Jenkins docker plugins as describe in above solution.
Or install docker itself in the Jenkins container and mount the docker.sock file.