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Playing docker with hypervisor container runtime runV

Jun 17, 2016
docker runv
2 min read

Table of contents:

[TOC]

The latest master branch of runV has already supported running as an runtime in docker. Since v1.11, docker introduced OCI contain runtime (runc) integration via containerd. Since runc and runV are both recommended implementation of OCI, it is natural to make runV working with containerd.

Now let’s have a try.

Install runv and docker

Docker could be installed via https://docs.docker.com/engine/installation/.

Since only master branch of runV supports running integrated with docker, we should compile runV by source.

sudo apt-get install -y autoconf automake pkg-config libdevmapper-dev libsqlite3-dev libvirt-dev qemu libvirt-bin
mkdir -p $GOPATH/src/github.com/hyperhq
cd $GOPATH/src/github.com/hyperhq
git clone https://github.com/hyperhq/runv
cd runv
./autogen.sh
./configure
make
make install

Start docker with runV runtime

Stop docker first since it is running with runc by default.

systemctl stop docker

Now start docker with runV:

# start containerd
systemd-run --unit=containerd-runv docker-containerd --debug -l /var/run/docker/libcontainerd/docker-containerd.sock --runtime /usr/local/bin/runv --runtime-args --debug --runtime-args --driver=libvirt --runtime-args --kernel=/var/lib/hyper/kernel --runtime-args --initrd=/var/lib/hyper/hyper-initrd.img --start-timeout 2m

# start docker
systemd-run --unit=docker-runv docker daemon -D -l debug --containerd=/var/run/docker/libcontainerd/docker-containerd.sock

# check status
[root@linux ~]# systemctl status containerd-runv
● containerd-runv.service - /usr/bin/docker-containerd --debug -l /var/run/docker/libcontainerd/docker-containerd.sock --runtime /usr/local/bin/runv --runtime-args --debug --runtime-args --driver=libvirt --runtime-args --kernel=/var/lib/hyper/kernel --runtime-args --initrd=/var/lib/hyper/hyper-initrd.img --start-timeout 2m
   Loaded: loaded (/run/systemd/system/containerd-runv.service; static; vendor preset: disabled)
  Drop-In: /run/systemd/system/containerd-runv.service.d
           └─50-Description.conf, 50-ExecStart.conf
   Active: active (running) since 五 2016-06-17 09:47:57 UTC; 10s ago
 Main PID: 12650 (docker-containe)
   Memory: 1.8M
   CGroup: /system.slice/containerd-runv.service
           └─12650 /usr/bin/docker-containerd --debug -l /var/run/docker/libcontainerd/docker-containerd.sock --run...

6月 17 09:47:57 linux systemd[1]: Started /usr/bin/docker-containerd --debug -l /var/run/docker/libcontainerd/docker...
6月 17 09:47:57 linux systemd[1]: Starting /usr/bin/docker-containerd --debug -l /var/run/docker/libcontainerd/docke...
6月 17 09:47:57 linux docker-containerd[12650]: time="2016-06-17T09:47:57Z" level=warning msg="containerd: low ...=4096
6月 17 09:47:57 linux docker-containerd[12650]: time="2016-06-17T09:47:57Z" level=debug msg="containerd: read p...unt=0
6月 17 09:47:57 linux docker-containerd[12650]: time="2016-06-17T09:47:57Z" level=debug msg="containerd: superv...nerd"
6月 17 09:47:57 linux docker-containerd[12650]: time="2016-06-17T09:47:57Z" level=debug msg="containerd: grpc a...sock"
Hint: Some lines were ellipsized, use -l to show in full.

[root@linux ~]# systemctl status docker-runv
● docker-runv.service - /usr/bin/docker daemon -D -l debug --containerd=/var/run/docker/libcontainerd/docker-containerd.sock
   Loaded: loaded (/run/systemd/system/docker-runv.service; static; vendor preset: disabled)
  Drop-In: /run/systemd/system/docker-runv.service.d
           └─50-Description.conf, 50-ExecStart.conf
   Active: active (running) since 五 2016-06-17 09:34:11 UTC; 25s ago
 Main PID: 11120 (docker)
   Memory: 20.8M
   CGroup: /system.slice/docker-runv.service
           └─11120 /usr/bin/docker daemon -D -l debug --containerd=/var/run/docker/libcontainerd/docker-containerd.sock

6月 17 09:34:13 linux docker[11120]: time="2016-06-17T09:34:13.019309548Z" level=debug msg="Registering POST, /volumes/create"
6月 17 09:34:13 linux docker[11120]: time="2016-06-17T09:34:13.019448115Z" level=debug msg="Registering DELETE, /volumes/{name:.*}"
6月 17 09:34:13 linux docker[11120]: time="2016-06-17T09:34:13.019551244Z" level=debug msg="Registering POST, /build"
6月 17 09:34:13 linux docker[11120]: time="2016-06-17T09:34:13.019607895Z" level=debug msg="Registering GET, /networks"
6月 17 09:34:13 linux docker[11120]: time="2016-06-17T09:34:13.019675700Z" level=debug msg="Registering GET, /networks/{id:.*}"
6月 17 09:34:13 linux docker[11120]: time="2016-06-17T09:34:13.019771551Z" level=debug msg="Registering POST, /networks/create"
6月 17 09:34:13 linux docker[11120]: time="2016-06-17T09:34:13.020256142Z" level=debug msg="Registering POST, /networks/{id:.*}/connect"
6月 17 09:34:13 linux docker[11120]: time="2016-06-17T09:34:13.020369131Z" level=debug msg="Registering POST, /networks/{id:.*}/disconnect"
6月 17 09:34:13 linux docker[11120]: time="2016-06-17T09:34:13.020463042Z" level=debug msg="Registering DELETE, /networks/{id:.*}"
6月 17 09:34:13 linux docker[11120]: time="2016-06-17T09:34:13.021491071Z" level=info msg="API listen on /var/run/docker.sock"

Create container

Let’s create a nginx container.

[root@linux ~]# docker run -i -d  nginx
6a34a0513ebbdb2c57d828bf4e814773c8a5cf6af8c35e4376f2028769a7c35c
[root@linux ~]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
6a34a0513ebb        nginx               "nginx -g 'daemon off"   9 seconds ago       Up 3 seconds        80/tcp, 443/tcp     berserk_mcnulty

# Is it working
[root@linux ~]# docker inspect --format '{{ .NetworkSettings.IPAddress }}' 6a34a0513ebb
172.17.0.2
[root@linux ~]# curl -I 172.17.0.2
HTTP/1.1 200 OK
Server: nginx/1.11.1
Date: Fri, 17 Jun 2016 09:52:37 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Tue, 31 May 2016 14:40:22 GMT
Connection: keep-alive
ETag: "574da256-264"
Accept-Ranges: bytes

Is the container really running in runV with hypervisor?

root@linux ~]# runv list
ID                                                                 PID         STATUS      BUNDLE                                                                                           CREATED
6a34a0513ebbdb2c57d828bf4e814773c8a5cf6af8c35e4376f2028769a7c35c   12756       running     /var/run/docker/libcontainerd/6a34a0513ebbdb2c57d828bf4e814773c8a5cf6af8c35e4376f2028769a7c35c   2016-06-17T09:48:38.324839156Z

[root@linux ~]# runv state 6a34a0513ebbdb2c57d828bf4e814773c8a5cf6af8c35e4376f2028769a7c35c
{
  "ociVersion": "0.6.0-dev",
  "id": "6a34a0513ebbdb2c57d828bf4e814773c8a5cf6af8c35e4376f2028769a7c35c",
  "pid": 12756,
  "bundlePath": "/var/run/docker/libcontainerd/6a34a0513ebbdb2c57d828bf4e814773c8a5cf6af8c35e4376f2028769a7c35c",
  "rootfsPath": "/var/run/docker/libcontainerd/6a34a0513ebbdb2c57d828bf4e814773c8a5cf6af8c35e4376f2028769a7c35c/rootfs",
  "status": "running",
  "created": "2016-06-17T09:48:38.324839156Z"
}

[root@linux ~]# virsh list
 Id    名称                         状态
----------------------------------------------------
 919   vm-CeaKLvbPEg                  running

[root@linux ~]# ps -ef | grep vm-CeaKLvbPEg | grep -v grep
root     12743     1  1 09:48 ?        00:00:06 /usr/bin/qemu-system-x86_64 -name vm-CeaKLvbPEg -S -machine pc-i440fx-2.0,accel=tcg,usb=off -cpu Haswell-noTSX,+abm,+hypervisor,+rdrand,+f16c,+osxsave,+ht,+vme -m 128 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid 4f158103-bd5e-4fd1-a62f-9e18093ceaf4 -nographic -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-vm-CeaKLvbPEg/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-reboot -boot strict=on -kernel /var/lib/hyper/kernel -initrd /var/lib/hyper/hyper-initrd.img -append console=ttyS0 panic=1 no_timer_check -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x3 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x2 -fsdev local,security_model=none,id=fsdev-fs0,path=/var/run/hyper/vm-CeaKLvbPEg/share_dir -device virtio-9p-pci,id=fs0,fsdev=fsdev-fs0,mount_tag=share_dir,bus=pci.0,addr=0x4 -chardev socket,id=charserial0,path=/var/run/hyper/vm-CeaKLvbPEg/console.sock,server,nowait -device isa-serial,chardev=charserial0,id=serial0 -chardev socket,id=charchannel0,path=/var/run/hyper/vm-CeaKLvbPEg/hyper.sock,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=sh.hyper.channel.0 -chardev socket,id=charchannel1,path=/var/run/hyper/vm-CeaKLvbPEg/tty.sock,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=sh.hyper.channel.1 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -msg timestamp=on

Is it stable?

Of course not, runV is still under quick development and features are not complete now. For example, there are a lot of commands not supported now:

  • docker stop
  • docker stats
  • docker exec

Although there are still problems, I’m exited by what runV has done. Looking forward to its release.

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