Harbour is a container node agent, which runs on the host machine, works as a proxy for users to eliminate the differences between containers. For example, harbour takes over docker local socket and network port to provides services for clients.
Harbour is implemented as a configurable, pluggable HTTP proxy for the Docker API. As a proxy, harbour stands between user and container engine. When receives command from user, harbour identify and dispatch it to corresponding container engine in backend, such as docker or rkt. At present, you can use docker client as a user client to communicate with harbour, and in the long run, harbour client will be provided for the convenience of customers.
Below is simplified figure for harbour design:
There is no doubt that container technology is becoming more and more popular. Imagine that, in the future, more and more container engine will come to the fore, and users have to learn how to operate different container engines. Actually, users do not care the differences between underlying container runtime, and they just want to use containers for their work. Now harbour will ease the burden of learning different container operations, users can only learn how to use harbour client(you can use docker client instead of it). What is more, in the programming level, harbour will provide a generic API for users who want to invoke containers.
At the time of writing, harbour can work as a proxy for docker and rkt, user can operate containers just by using docker client(harbour client will be provided in the future), without concern for differences in backend container engine. Support for other containers(e.g. OCI) is already under way. It's a work in progress, so bear with us:)
Prior to embark on a journey of harbour, we recommend you take a look at the video below, which demonstrated how to use harbour as a rkt proxy.
Although harbour is still in development, we encourage you to try out the tool and give feedback.
Installation is simple as:
go get github.com/huawei-openlab/harbouror as involved as:
# create a 'github.com/huawei-openlab' directory in your GOPATH/src
cd github.com/huawei-openlab
git clone https://github.com/huawei-openlab/harbour
cd harbour
make
sudo make install$ ./harbour
Usage: harbour [OPTIONS] [arg...]
Options:
--container-runtime=docker Container runtime to choose
-D, --debug=false Enable debug mode
-d, --daemon=false Enable daemon mode
--docker-sock=/var/run/docker-real.sock Path to docker sock file
-G, --group=docker Group for the unix socket
-H, --host=[] Daemon socket(s) to connect to
-h, --help=false Print usage
-v, --version=false Print version information and quit
Commands:
Run 'harbour COMMAND --help' for more information on a command.
Make sure docker located in PATH, run docker daemon, and do the following work:
- If binary used, run docker daemon with
-H unix:///var/run/docker-real.sock - If ubuntu lxc-docker used, open file
/etc/default/docker, add-H unix:///var/run/docker-real.sockinDOCKER_OPTS, save and restart docker. - If systemd used to manage docker service, open the service file corresponding to docker, add
-H unix:///var/run/docker-real.sock, save andsystemctl restart docker.
Then run harbour -d D using root(Listen to /var/run/docker.sock and forward it to /var/run/docker-real.sock by default)
harbour -d -D --docker-sock=/var/run/dockerxxx.sock(specified sock for docker) -H unix:///a/b/c.sock(specified sock for harbour) -H tcp://:4567(specified tcp port for harbour)
Harbour works as a proxy of docker by default. Below is an example of harbour working for docker in default mode:
- Run harbour daemon
$ ./harbour -d -D &
[1] 15127
root@ubuntu:~/Applications/Go/src/github.com/huawei-openlab/harbour# DEBU[0000] trap init...
DEBU[0000] Registering GET,
DEBU[0000] Registering POST,
DEBU[0000] Registering DELETE,
DEBU[0000] Listening for HTTP on unix (/var/run/docker.sock)
DEBU[0000] docker group found. gid: 999
- Run docker daemon with parameters
$ docker -d -H unix:///var/run/docker-real.sock &
[2] 15131
INFO[0000] Listening for HTTP on unix (/var/run/docker-real.sock)
INFO[0000] [graphdriver] using prior storage driver "aufs"
INFO[0000] Loading containers: start.
....................
INFO[0000] Loading containers: done.
INFO[0000] Daemon has completed initialization
INFO[0000] Docker daemon commit=786b29d execdriver=native-0.2 graphdriver=aufs version=1.7.1
- Run docker client
$ docker images
DEBU[0512] Calling GET
DEBU[0512] Request get: &{GET /v1.19/images/json HTTP/1.1 1 1 map[User-Agent:[Docker-Client/1.7.1]] 0x8f5e30 0 [] false /var/run/docker.sock map[] map[] <nil> map[] @ /v1.19/images/json <nil>}
DEBU[0512] Request's url: /v1.19/images/json
INFO[0292] GET /v1.19/images/json
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
busybox latest 17583c7dd0da 8 days ago 1.109 MB
ubuntu latest a5a467fddcb8 2 weeks ago 187.9 MB
<none> <none> 8c2e06607696 6 months ago 2.433 MB
If you want harbour to work as a proxy for rkt, --container-runtime=rkt option can be added when harbour daemon started. Example illustrated as below:
- Install rkt
wget https://github.com/coreos/rkt/releases/download/v0.11.0/rkt-v0.11.0.tar.gz
tar xzvf rkt-v0.11.0.tar.gz
cd rkt-v0.11.0
cp * /usr/local/bin- Run harbour daemon in rkt proxy mode
$ ./harbour --container-runtime=rkt -d -D &
[3] 25594
DEBU[0000] trap init...
DEBU[0000] Registering POST,
DEBU[0000] Registering DELETE,
DEBU[0000] Registering GET,
DEBU[0000] Listening for HTTP on unix (/var/run/docker.sock)
DEBU[0000] docker group found. gid: 999
- Run docker daemon with parameters
$ docker -d -H unix:///var/run/docker-real.sock &
[2] 15131
INFO[0000] Listening for HTTP on unix (/var/run/docker-real.sock)
INFO[0000] [graphdriver] using prior storage driver "aufs"
INFO[0000] Loading containers: start.
....................
INFO[0000] Loading containers: done.
INFO[0000] Daemon has completed initialization
INFO[0000] Docker daemon commit=786b29d execdriver=native-0.2 graphdriver=aufs version=1.7.1
- Handle user requests by using Docker cmd
$ docker run busybox
DEBU[1397] Calling POST
DEBU[1397] Request get: &{POST /v1.19/containers/create HTTP/1.1 1 1 map[User-Agent:[Docker-Client/1.7.1] Content-Length:[961] Content-Type:[application/json]] 0xc20800a1c0 961 [] false /var/run/docker.sock map[] map[] <nil> map[] @ /v1.19/containers/create <nil>}
DEBU[1397] Request's url :/v1.19/containers/create
DEBU[1397] Request's url path: /v1.19/containers/create
DEBU[1397] Transforwarding request body: {"Hostname":"","Domainname":"","User":"","AttachStdin":false,"AttachStdout":true,"AttachStderr":true,"PortSpecs":null,"ExposedPorts":{},"Tty":false,"OpenStdin":false,"StdinOnce":false,"Env":[],"Cmd":null,"Image":"busybox","Volumes":{},"VolumeDriver":"","WorkingDir":"","Entrypoint":null,"NetworkDisabled":false,"MacAddress":"","OnBuild":null,"Labels":{},"HostConfig":{"Binds":null,"ContainerIDFile":"","LxcConf":[],"Memory":0,"MemorySwap":0,"CpuShares":0,"CpuPeriod":0,"CpusetCpus":"","CpusetMems":"","CpuQuota":0,"BlkioWeight":0,"OomKillDisable":false,"Privileged":false,"PortBindings":{},"Links":null,"PublishAllPorts":false,"Dns":null,"DnsSearch":null,"ExtraHosts":null,"VolumesFrom":null,"Devices":[],"NetworkMode":"bridge","IpcMode":"","PidMode":"","UTSMode":"","CapAdd":null,"CapDrop":null,"RestartPolicy":{"Name":"no","MaximumRetryCount":0},"SecurityOpt":null,"ReadonlyRootfs":false,"Ulimits":null,"LogConfig":{"Type":"","Config":{}},"CgroupParent":""}}
Downloading d1592a710ac3: [====================================] 674 KB/674 KB
Downloading 17583c7dd0da: [====================================] 32 B/32 B
2015/11/13 11:43:16 Preparing stage1
2015/11/13 11:43:16 Writing image manifest
2015/11/13 11:43:16 Loading image sha512-cf74c26d8d35555066dce70bd94f513b90cbef6e7e9c01ea0c971f4f6d689848
2015/11/13 11:43:16 Writing pod manifest
2015/11/13 11:43:16 Setting up stage1
2015/11/13 11:43:16 Wrote filesystem to /var/lib/rkt/pods/run/a49cd96c-56b2-4e18-9a0c-af2ed272729a
2015/11/13 11:43:16 Pivoting to filesystem /var/lib/rkt/pods/run/a49cd96c-56b2-4e18-9a0c-af2ed272729a
2015/11/13 11:43:16 Execing /init
/ #
$ docker images
DEBU[0222] Calling GET
DEBU[0222] Request get: &{GET /v1.19/images/json HTTP/1.1 1 1 map[User-Agent:[Docker-Client/1.7.1]] 0x8f7e30 0 [] false /var/run/docker.sock map[] map[] <nil> map[] @ /v1.19/images/json <nil>}
DEBU[0222] Request's url :/v1.19/images/json
DEBU[0222] Request's url path: /v1.19/images/json
DEBU[0222] Transforwarding request body:
KEY APPNAME IMPORTTIME LATEST
sha512-ca0bee4ecb888d10cf0816ebe7e16499230ab349bd3126976ab60b9b1db2e120 coreos.com/rkt/stage1:0.8.0 2015-09-15 17:38:15.068 +0800 CST false
sha512-b56f0c5d3808771c5571c1d98629eab0ec02dfe71910ff57c13a32a1497f1add example:0.0.1 2015-09-15 17:39:17.747 +0800 CST false
sha512-f7120d3a61fd72c746b3550a4d2ae55f0119c8086d5f1e6afe8310fe2cc4f4aa example:0.0.1 2015-09-15 17:50:08.142 +0800 CST false
sha512-6f7cd1c85308e01c3e9e628804c6c01510c3f4895ff1674d9ece91d4bf87874d example:0.0.1 2015-09-15 17:58:31.36 +0800 CST false
sha512-077395c1a7acf9543f202f1182540bad42d452127d0f57baae30a3e3e8b2f5cb example:0.0.1 2015-09-15 19:24:08.305 +0800 CST false
sha512-13885d66415514cdf908a033a7d2025c9cdf5fed2336fa7ea2e8821e440de9cb example:0.0.1 2015-09-16 14:29:25.522 +0800 CST false
sha512-e3369b474208cd5d8aa40d04a6c609d5feace3c56501cbabed2b847db93941ef example:0.0.1 2015-09-16 14:38:35.04 +0800 CST false
Now you can operate rkt containers just by using docker client, enjoy it:-)
If any issues are encountered while using the harbour project, several avenues are available for support:
| Issue Tracker | https://github.com/huawei-openlab/harbour/issues |
|---|---|
| Google Groups | https://groups.google.com/forum/#!forum/harbour-dev |
- Container(docker,rkt,lxc) developer/user
- Ones who want to use container but do not care underlying runtime.
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You just add a line to every git commit message, like this:
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Use your real name (sorry, no pseudonyms or anonymous contributions.)
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