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Merge pull request #2132 from tonistiigi/ssh-mux 

connhelper: use ssh multiplexing
This commit is contained in:
Sebastiaan van Stijn 2020-01-09 23:12:25 +01:00 committed by GitHub
parent af097b2618 4ecbef4660
commit a4f60165b7
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 22 additions and 1 deletions
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21
cli/connhelper/connhelper.go
View File

@ -5,7 +5,10 @@ import (
"context"
"net"
"net/url"
"os"
"strconv"
"github.com/docker/cli/cli/config"
"github.com/docker/cli/cli/connhelper/commandconn"
"github.com/docker/cli/cli/connhelper/ssh"
"github.com/pkg/errors"
@ -34,7 +37,7 @@ func GetConnectionHelper(daemonURL string) (*ConnectionHelper, error) {
}
return &ConnectionHelper{
Dialer: func(ctx context.Context, network, addr string) (net.Conn, error) {
return commandconn.New(ctx, "ssh", append(sp.Args(), []string{"--", "docker", "system", "dial-stdio"}...)...)
return commandconn.New(ctx, "ssh", append(multiplexingArgs(), append(sp.Args(), []string{"--", "docker", "system", "dial-stdio"}...)...)...)
},
Host: "http://docker",
}, nil
@ -53,3 +56,19 @@ func GetCommandConnectionHelper(cmd string, flags ...string) (*ConnectionHelper,
Host: "http://docker",
}, nil
}
func multiplexingArgs() []string {
if v := os.Getenv("DOCKER_SSH_NO_MUX"); v != "" {
if b, err := strconv.ParseBool(v); err == nil && b {
return nil
}
}
if err := os.MkdirAll(config.Dir(), 0700); err != nil {
return nil
}
args := []string{"-o", "ControlMaster=auto", "-o", "ControlPath=" + config.Dir() + "/%r@%h:%p"}
if v := os.Getenv("DOCKER_SSH_MUX_PERSIST"); v != "" {
args = append(args, "-o", "ControlPersist="+v)
}
return args
}

2
docs/reference/commandline/cli.md
View File

@ -86,6 +86,8 @@ by the `docker` command line:
* `DOCKER_TMPDIR` Location for temporary Docker files.
* `DOCKER_CONTEXT` Specify the context to use (overrides DOCKER_HOST env var and default context set with "docker context use")
* `DOCKER_DEFAULT_PLATFORM` Specify the default platform for the commands that take the `--platform` flag.
* `DOCKER_SSH_NO_MUX` If set will turn off SSH multiplexing when connecting to daemon through SSH.
* `DOCKER_SSH_MUX_PERSIST` Set a duration for keeping SSH multiplexing socket alive between commands (e.g `60s`).
Because Docker is developed using Go, you can also use any environment
variables used by the Go runtime. In particular, you may find these useful: