Jenkins¶

`Jenkinsfile`¶

sudo systemctl edit jenkins

[Service]
Environment="JAVA_OPTS=-Dhudson.model.DirectoryBrowserSupport.CSP= -Dhudson.plugins.git.GitSCM.ALLOW_LOCAL_CHECKOUT=true"

sudo systemctl restart jenkins

If necessary, replace 127.0.0.1:8080 with the address of your Jenkins server.

Note

Declarative Pipeline supports an environment directive, whereas users of Scripted Pipeline must use the withEnv step.

In Jenkins, any pipeline or job can access and read global environment variables. Go to Dashboard → Configure System → Global properties → Environment variables.
Jenkins local Environment Variables:
1. You can set a local environment variable in Jenkins using the declarative pipeline.
```
   environment {
       DEPLOY_TO = 'staging'
   }
```
  Note
  - An environment directive used in the top-level pipeline block will apply to all steps within the Pipeline.
  - An environment directive defined within a stage will only apply the given environment variables to steps within the stage.
2. Or using an env object in a script to imperatively define an environment variable:
```
script {
    env.DEPLOY_TO = "staging"
}
```
  3.Or using a withEnv([]) {} block sets a local environment variable as part of a scripted pipeline:
```
withEnv(["DEPLOY_TO=staging"])
```
3. You can use the Environment Injector plugin.

The Jenkins pipeline allows users to override environment variables, changing the current value of the variable with a new one.

The override process follows several rules when determining variable priority:

The withEnv([]) { } block overrides any environment variable.
Variables set using the env object cannot override those set using the environment {} block.
Variables set using the env object can only override other variables set with the env object.

def username = 'Jenkins'
echo 'Hello Mr. ${username}'
echo "I said, Hello Mr. ${username}"

Hello Mr. ${username}
I said, Hello Mr. Jenkins

What's next?

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