docker is a lightweight docker libary that uses only the golang standard libary. This library can be used for basic operations like start, stop, create and delete containers.
Example: create, start, stop and delete a container
package main
import (
"log"
"time"
"github.com/grid-x/docker"
)
func main() {
dc := docker.NewClient("/var/run/docker.sock")
const container = "gridx-docker-test"
log.Printf("create container %s", container)
exposedPorts := []string{"80/tcp"}
cID, err := dc.CreateContainer(container, "nginxdemos/hello:plain-text", nil, exposedPorts, nil)
if err != nil {
log.Println(err)
}
defer func() {
log.Printf("delete container %s", container)
if err := dc.DeleteContainer(cID); err != nil {
log.Println(err)
}
}()
log.Printf("start container %s", container)
if err := dc.StartContainer(cID); err != nil {
log.Println(err)
}
defer func() {
log.Printf("stop container %s", container)
if err := dc.StopContainer(cID); err != nil {
log.Println(err)
}
}()
// simulating a running program. During this time we can check if
// everything was started by entering docker network ls and
// docker container ps.
time.Sleep(time.Second * 60)
}Example: Create a container from a container and connect both containers via a docker network
package main
import (
"fmt"
"log"
"os"
"time"
"github.com/grid-x/docker"
)
func main() {
dc := docker.NewClient("/var/run/docker.sock")
// get containerID e.g.:
// docker run --rm -it ubuntu:latest
// root@ef3e8b0e9c4c:/# echo $HOSTNAME
// ef3e8b0e9c4c
myID := os.Getenv("HOSTNAME")
log.Println("myID", myID)
var i int
network := fmt.Sprintf("test_net_%d", i)
log.Printf("create network %s", network)
nwID, err := dc.CreateNetwork(network)
if err != nil {
log.Fatal(err)
}
log.Println("networkID", nwID)
defer dc.DeleteNetwork(nwID)
container := fmt.Sprintf("test_%d", i)
log.Printf("create container %s", container)
exposedPorts := []string{"80/tcp"}
cID, err := dc.CreateContainer(container, "nginxdemos/hello:plain-text", nil, exposedPorts, nil)
if err != nil {
log.Println(err)
}
defer dc.DeleteContainer(cID)
if err := dc.ConnectNetwork(myID, nwID, nil); err != nil {
log.Println(err)
}
defer dc.DisconnectNetwork(myID, nwID)
if err := dc.ConnectNetwork(cID, nwID, nil); err != nil {
log.Println(err)
}
defer dc.DisconnectNetwork(cID, nwID)
if err := dc.StartContainer(cID); err != nil {
log.Println(err)
}
defer dc.StopContainer(cID)
// simulating a running program. During this time we can check if
// everything was started by entering docker network ls and
// docker container ps.
time.Sleep(time.Second * 60)
}