terraform plan fails when run from Jenkins docker container - docker

Question

I don't know what possessed me to do this. I am just a tinker so I started following this tutorial. https://www.jenkins.io/doc/book/pipeline/docker/ I got that to work. Then I wanted to create a pipeline that would download a terraform docker container and use that to create a docker container. Here's my Jenkinsfile:
pipeline {
agent {
docker {
image 'hashicorp/terraform:light'
args '-i --entrypoint='
}
}
stages {
stage('Hello') {
steps {
echo 'Hello World from Github.'
}
}
stage('Test') {
steps {
sh 'ls -al'
sh 'terraform --version'
sh 'terraform init'
sh 'terraform plan'
sh 'ls -al'
}
}
}
}
Here is my main.tf:
terraform {
required_providers {
docker = {
source = "kreuzwerker/docker"
version = "~> 2.13.0"
}
}
}
// This didn't work either:
// provider "docker" {}
provider "docker" {
host = "tcp://127.0.0.1:2375/"
}
resource "docker_image" "nginx" {
name = "nginx:latest"
keep_locally = false
}
resource "docker_container" "nginx" {
image = docker_image.nginx.latest
name = "tutorial"
ports {
internal = 80
external = 8000
}
}
Here is the error message from my Jenkins console output:
[Pipeline] sh
+ terraform plan
[31m╷[0m[0m
[31m│[0m [0m[1m[31mError: [0m[0m[1mError pinging Docker server:
Cannot connect to the Docker daemon at tcp://127.0.0.1:2375/.
Is the docker daemon running?[0m
[31m│[0m [0m
[31m│[0m [0m[0m with provider["registry.terraform.io/kreuzwerker/docker"],
[31m│[0m [0m on main.tf line 10, in provider "docker":
[31m│[0m [0m 10: provider "docker" [4m{[0m[0m
[31m│[0m [0m
[31m╵[0m[0m
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
Jenkins is running in a docker container on my Mac laptop:
red#Reds-MacBook-Pro ~ % docker ps | grep jenk
8401359dae3e myjenkins-blueocean:2.346.2-1 "/usr/bin/tini -- /u…" 19 hours ago Up 19 hours 0.0.0.0:8080->8080/tcp, 0.0.0.0:50000->50000/tcp jenkins-blueocean
507eb2212eb6 docker:dind "dockerd-entrypoint.…" 19 hours ago Up 19 hours 2375/tcp, 0.0.0.0:2376->2376/tcp jenkins-docker