Jenkins docker not found

[adrian lee]

Hi all, 

I am trying to use docker with Jenkins. 

I installed it as a global toolconfiguration call myDocker. 

I then tried to write a pipeline script as below

```
pipeline {
   agent any
    
   // set path
   stages {
      stage ('set docker path'){
          steps{
              script{
                  def dockerHome = tool 'myDocker'
                  env.PATH = "${dockerHome}/bin:${env.PATH}"
              }
            sh 'docker ps'
          }
      }

      //delete
      stage('node') {
        agent {
            docker { image 'node:7-alpine' }
        }
        steps {
            sh 'node --version'
        }
      }


   }
}
```

however, it keeps throwing me an error

```
+ docker ps
/var/lib/jenkins/workspace/openFaaS_getdata@tmp/durable-270f2b11/script.sh: 
line 1: docker: command not found

```

I tried referencing other posts on stack overflow but could not find what 
is wrong. 

Any help?

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