// EnsureDocker attempts to connect to the Docker daemon defined by the helper,
// and if it is unable to it will print a warning.
func (c *NodeConfig) EnsureDocker(docker *dockerutil.Helper) {
dockerClient, dockerAddr, err := docker.GetKubeClient()
if err != nil {
c.HandleDockerError(fmt.Sprintf("Unable to create a Docker client for %s - Docker must be installed and running to start containers.\n%v", dockerAddr, err))
return
}
if url, err := url.Parse(dockerAddr); err == nil && url.Scheme == "unix" && len(url.Path) > 0 {
s, err := os.Stat(url.Path)
switch {
case os.IsNotExist(err):
c.HandleDockerError(fmt.Sprintf("No Docker socket found at %s. Have you started the Docker daemon?", url.Path))
return
case os.IsPermission(err):
c.HandleDockerError(fmt.Sprintf("You do not have permission to connect to the Docker daemon (via %s). This process requires running as the root user.", url.Path))
return
case err == nil && s.IsDir():
c.HandleDockerError(fmt.Sprintf("The Docker socket at %s is a directory instead of a unix socket - check that you have configured your connection to the Docker daemon properly.", url.Path))
return
}
}
if err := dockerClient.Ping(); err != nil {
c.HandleDockerError(fmt.Sprintf("Docker could not be reached at %s. Docker must be installed and running to start containers.\n%v", dockerAddr, err))
return
}
glog.Infof("Connecting to Docker at %s", dockerAddr)
version, err := dockerClient.Version()
if err != nil {
c.HandleDockerError(fmt.Sprintf("Unable to check for Docker server version.\n%v", err))
return
}
serverVersion, err := dockerclient.NewAPIVersion(version.APIVersion)
if err != nil {
c.HandleDockerError(fmt.Sprintf("Unable to determine Docker server version from %q.\n%v", version.APIVersion, err))
return
}
minimumPullByIDVersion, err := dockerclient.NewAPIVersion(minimumDockerAPIVersionWithPullByID)
if err != nil {
c.HandleDockerError(fmt.Sprintf("Unable to check for Docker server version.\n%v", err))
return
}
if serverVersion.LessThan(minimumPullByIDVersion) {
c.HandleDockerError(fmt.Sprintf("Docker 1.6 or later (server API version 1.18 or later) required."))
return
}
c.DockerClient = dockerClient
}
