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Merge pull request #4020 from PhracturedBlue/socket-activation

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Support systemd socket-activation
This commit is contained in:
Milos Gajdos 2023-09-21 09:08:55 +01:00 committed by GitHub
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13 changed files with 564 additions and 7 deletions
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2
docs/configuration.md
View file

@ -729,7 +729,7 @@ registry.
| Parameter | Required | Description |
|-----------|----------|-------------------------------------------------------|
| `addr` | yes | The address for which the server should accept connections. The form depends on a network type (see the `net` option). Use `HOST:PORT` for TCP and `FILE` for a UNIX socket. |
| `addr` | no | The address for which the server should accept connections. The form depends on a network type (see the `net` option). Use `HOST:PORT` for TCP and `FILE` for a UNIX socket. The `addr` field is only optional if socket-activation is used (in which case `addr` and `net` are ignored regardless of if they are specified). |
| `net` | no | The network used to create a listening socket. Known networks are `unix` and `tcp`. |
| `prefix` | no | If the server does not run at the root path, set this to the value of the prefix. The root path is the section before `v2`. It requires both preceding and trailing slashes, such as in the example `/path/`. |
| `host` | no | A fully-qualified URL for an externally-reachable address for the registry. If present, it is used when creating generated URLs. Otherwise, these URLs are derived from client requests. |

1
docs/recipes/index.md
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@ -25,3 +25,4 @@ At this point, it's assumed that:
* [using Nginx as an authenticating proxy](nginx.md)
* [running a Registry on macOS](osx-setup-guide.md)
* [mirror the Docker Hub](mirror.md)
* [start registry via systemd](systemd.md)

105
docs/recipes/systemd.md Normal file
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@ -0,0 +1,105 @@
---
description: Using systemd to manage registry container
keywords: registry, on-prem, systemd, socket-activated, recipe, advanced
title: Start registry via systemd
---
## Use-case
Using systemd to manage containers can make service discovery and maintenance easier
by managining all services in the same way. Additionally, when using Podman, systemd
can start the registry with socket-activation, providing additional security options:
* Run as non-root and expose on a low-numbered socket (< 1024)
* Run with `--network=none`
### Docker
When deploying the registry via Docker, a simple service file can be used to manage
the registry:
registry.service
```
[Unit]
Description=Docker registry
After=docker.service
Requires=docker.service
[Service]
#TimeoutStartSec=0
Restart=always
ExecStartPre=-/usr/bin/docker stop %N
ExecStartPre=-/usr/bin/docker rm %N
ExecStart=/usr/bin/docker run --name %N \
-v registry:/var/lib/registry \
-p 5000:5000 \
registry:2
[Install]
WantedBy=multi-user.target
```
In this case, the registry will store images in the named-volume `registry`.
Note that the container is destroyed on restart instead of using `--rm` or
destroy on stop. This is done to make accessing `docker logs ...` easier in
the case of issues.
### Podman
Podman offers tighter integration with systemd than Docker does, and supports
socket-activation of containers.
#### Create service file
```
podman create --name registry --network=none -v registry:/var/lib/registry registry:2
podman generate systemd --name --new registry > registry.service
```
#### Create socket file
registry.socket
```
[Unit]
Description=container registry
[Socket]
ListenStream=5000
[Install]
WantedBy=sockets.target
```
### Installation
Installation can be either rootful or rootless. For Docker, rootless configurations
often include additional setup steps that are beyond the scope of this recipe, whereas
for Podman, rootless containers generally work out of the box.
#### Rootful
Run as root:
* Copy registry.service (and registry.socket if relevant) to /etc/systemd/service/
* Run `systemctl daemon-reload`
* Enable the service:
* When using socket activation: `systemctl enable registry.socket`
* When **not** using socket activation: `systemctl enable registry.service`
* Start the service:
* When using socket activation: `systemctl start registry.socket`
* When **not** using socket activation: `systemctl start registry.service`
#### Rootless
Run as the target user:
* Copy registry.service (and registry.socket if relevant) to ~/.config/systemd/user/
* Run `systemctl --user daemon-reload`
* Enable the service:
* When using socket activation: `systemctl --user enable registry.socket`
* When **not** using socket activation: `systemctl --user enable registry.service`
* Start the service:
* When using socket activation: `systemctl --user start registry.socket`
* When **not** using socket activation: `systemctl --user start registry.service`
**Note**: To have rootless services start on boot, it may be necessary to enable linger
via `loginctl enable-linger $USER`.

1
go.mod
View file

@ -10,6 +10,7 @@ require (
github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v1.0.0
github.com/aws/aws-sdk-go v1.44.325
github.com/bshuster-repo/logrus-logstash-hook v1.0.0
github.com/coreos/go-systemd/v22 v22.5.0
github.com/distribution/reference v0.5.0
github.com/docker/go-events v0.0.0-20190806004212-e31b211e4f1c
github.com/docker/go-metrics v0.0.1

3
go.sum
View file

@ -83,6 +83,8 @@ github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5P
github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
github.com/coreos/go-systemd/v22 v22.5.0 h1:RrqgGjYQKalulkV8NGVIfkXQf6YYmOyiJKk8iXXhfZs=
github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
github.com/cyphar/filepath-securejoin v0.2.3/go.mod h1:aPGpWjXOXUn2NCNjFvBE6aRxGGx79pTxQpKOJNYHHl4=
@ -123,6 +125,7 @@ github.com/go-logr/logr v1.2.4/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbV
github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
github.com/golang-jwt/jwt/v4 v4.5.0 h1:7cYmW1XlMY7h7ii7UhUyChSgS5wUJEnm9uZVTGqOWzg=
github.com/golang-jwt/jwt/v4 v4.5.0/go.mod h1:m21LjoU+eqJr34lmDMbreY2eSTRJ1cv77w39/MY0Ch0=

28
registry/listener/listener.go
View file

@ -5,6 +5,9 @@ import (
"net"
"os"
"time"
"github.com/coreos/go-systemd/v22/activation"
log "github.com/sirupsen/logrus"
)
// tcpKeepAliveListener sets TCP keep-alive timeouts on accepted
@ -29,13 +32,26 @@ func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
// NewListener announces on laddr and net. Accepted values of the net are
// 'unix' and 'tcp'
func NewListener(net, laddr string) (net.Listener, error) {
switch net {
case "unix":
return newUnixListener(laddr)
case "tcp", "": // an empty net means tcp
return newTCPListener(laddr)
listeners, err := activation.Listeners()
if err != nil {
return nil, fmt.Errorf("Socket activation failed: %v", err)
}
switch len(listeners) {
case 0:
// No socket-activation found
switch net {
case "unix":
return newUnixListener(laddr)
case "tcp", "": // an empty net means tcp
return newTCPListener(laddr)
default:
return nil, fmt.Errorf("unknown address type %s", net)
}
case 1:
log.Info("Using systemd socket activation instead of any configured network listeners")
return listeners[0], nil
default:
return nil, fmt.Errorf("unknown address type %s", net)
return nil, fmt.Errorf("Found %d socket-activation listeners, only expected 1", len(listeners))
}
}

191
vendor/github.com/coreos/go-systemd/v22/LICENSE generated vendored Normal file
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@ -0,0 +1,191 @@
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6. Trademarks.
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APPENDIX: How to apply the Apache License to your work
To apply the Apache License to your work, attach the following boilerplate
notice, with the fields enclosed by brackets "[]" replaced with your own
identifying information. (Don't include the brackets!) The text should be
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Licensed under the Apache License, Version 2.0 (the "License");
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Unless required by applicable law or agreed to in writing, software
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
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5
vendor/github.com/coreos/go-systemd/v22/NOTICE generated vendored Normal file
View file

@ -0,0 +1,5 @@
CoreOS Project
Copyright 2018 CoreOS, Inc
This product includes software developed at CoreOS, Inc.
(http://www.coreos.com/).

70
vendor/github.com/coreos/go-systemd/v22/activation/files_unix.go generated vendored Normal file
View file

@ -0,0 +1,70 @@
// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build !windows
// +build !windows
// Package activation implements primitives for systemd socket activation.
package activation
import (
"os"
"strconv"
"strings"
"syscall"
)
const (
// listenFdsStart corresponds to `SD_LISTEN_FDS_START`.
listenFdsStart = 3
)
// Files returns a slice containing a `os.File` object for each
// file descriptor passed to this process via systemd fd-passing protocol.
//
// The order of the file descriptors is preserved in the returned slice.
// `unsetEnv` is typically set to `true` in order to avoid clashes in
// fd usage and to avoid leaking environment flags to child processes.
func Files(unsetEnv bool) []*os.File {
if unsetEnv {
defer os.Unsetenv("LISTEN_PID")
defer os.Unsetenv("LISTEN_FDS")
defer os.Unsetenv("LISTEN_FDNAMES")
}
pid, err := strconv.Atoi(os.Getenv("LISTEN_PID"))
if err != nil || pid != os.Getpid() {
return nil
}
nfds, err := strconv.Atoi(os.Getenv("LISTEN_FDS"))
if err != nil || nfds == 0 {
return nil
}
names := strings.Split(os.Getenv("LISTEN_FDNAMES"), ":")
files := make([]*os.File, 0, nfds)
for fd := listenFdsStart; fd < listenFdsStart+nfds; fd++ {
syscall.CloseOnExec(fd)
name := "LISTEN_FD_" + strconv.Itoa(fd)
offset := fd - listenFdsStart
if offset < len(names) && len(names[offset]) > 0 {
name = names[offset]
}
files = append(files, os.NewFile(uintptr(fd), name))
}
return files
}

21
vendor/github.com/coreos/go-systemd/v22/activation/files_windows.go generated vendored Normal file
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@ -0,0 +1,21 @@
// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package activation
import "os"
func Files(unsetEnv bool) []*os.File {
return nil
}

103
vendor/github.com/coreos/go-systemd/v22/activation/listeners.go generated vendored Normal file
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@ -0,0 +1,103 @@
// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package activation
import (
"crypto/tls"
"net"
)
// Listeners returns a slice containing a net.Listener for each matching socket type
// passed to this process.
//
// The order of the file descriptors is preserved in the returned slice.
// Nil values are used to fill any gaps. For example if systemd were to return file descriptors
// corresponding with "udp, tcp, tcp", then the slice would contain {nil, net.Listener, net.Listener}
func Listeners() ([]net.Listener, error) {
files := Files(true)
listeners := make([]net.Listener, len(files))
for i, f := range files {
if pc, err := net.FileListener(f); err == nil {
listeners[i] = pc
f.Close()
}
}
return listeners, nil
}
// ListenersWithNames maps a listener name to a set of net.Listener instances.
func ListenersWithNames() (map[string][]net.Listener, error) {
files := Files(true)
listeners := map[string][]net.Listener{}
for _, f := range files {
if pc, err := net.FileListener(f); err == nil {
current, ok := listeners[f.Name()]
if !ok {
listeners[f.Name()] = []net.Listener{pc}
} else {
listeners[f.Name()] = append(current, pc)
}
f.Close()
}
}
return listeners, nil
}
// TLSListeners returns a slice containing a net.listener for each matching TCP socket type
// passed to this process.
// It uses default Listeners func and forces TCP sockets handlers to use TLS based on tlsConfig.
func TLSListeners(tlsConfig *tls.Config) ([]net.Listener, error) {
listeners, err := Listeners()
if listeners == nil || err != nil {
return nil, err
}
if tlsConfig != nil {
for i, l := range listeners {
// Activate TLS only for TCP sockets
if l.Addr().Network() == "tcp" {
listeners[i] = tls.NewListener(l, tlsConfig)
}
}
}
return listeners, err
}
// TLSListenersWithNames maps a listener name to a net.Listener with
// the associated TLS configuration.
func TLSListenersWithNames(tlsConfig *tls.Config) (map[string][]net.Listener, error) {
listeners, err := ListenersWithNames()
if listeners == nil || err != nil {
return nil, err
}
if tlsConfig != nil {
for _, ll := range listeners {
// Activate TLS only for TCP sockets
for i, l := range ll {
if l.Addr().Network() == "tcp" {
ll[i] = tls.NewListener(l, tlsConfig)
}
}
}
}
return listeners, err
}

38
vendor/github.com/coreos/go-systemd/v22/activation/packetconns.go generated vendored Normal file
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@ -0,0 +1,38 @@
// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package activation
import (
"net"
)
// PacketConns returns a slice containing a net.PacketConn for each matching socket type
// passed to this process.
//
// The order of the file descriptors is preserved in the returned slice.
// Nil values are used to fill any gaps. For example if systemd were to return file descriptors
// corresponding with "udp, tcp, udp", then the slice would contain {net.PacketConn, nil, net.PacketConn}
func PacketConns() ([]net.PacketConn, error) {
files := Files(true)
conns := make([]net.PacketConn, len(files))
for i, f := range files {
if pc, err := net.FilePacketConn(f); err == nil {
conns[i] = pc
f.Close()
}
}
return conns, nil
}

3
vendor/modules.txt vendored
View file

@ -154,6 +154,9 @@ github.com/bshuster-repo/logrus-logstash-hook
# github.com/cespare/xxhash/v2 v2.2.0
## explicit; go 1.11
github.com/cespare/xxhash/v2
# github.com/coreos/go-systemd/v22 v22.5.0
## explicit; go 1.12
github.com/coreos/go-systemd/v22/activation
# github.com/cyphar/filepath-securejoin v0.2.4
## explicit; go 1.13
github.com/cyphar/filepath-securejoin