learning docker steps(9) ----- arm linux docker 安装

参考：https://docs.docker.com/install/linux/docker-ce/ubuntu/#install-docker-ce-1

想要在arm linux上安装docker

很多的思路都是基于挂载标准的arm linux ubuntu rootfs，然后通过apt-get install 安装相应的软件；

本人也是基于arm linux ubuntu rootfs来测试的。

指定其storage-driver : overlay

root@IoTP:~# cat /etc/docker/daemon.json
{
"storage-driver": "overlay"
}

运行docker ：

systemctl start docker.service

运行成功之后，可以查询

root@IoTP:~# docker info
Containers: 2
Running: 0
Paused: 0
Stopped: 2
Images: 1
Server Version: 17.03.0-ce
Storage Driver: overlay
Backing Filesystem: extfs
Supports d_type: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host macvlan null overlay
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 977c511eda0925a723debdc94d09459af49d082a
runc version: a01dafd48bc1c7cc12bdb01206f9fea7dd6feb70
init version: 949e6fa
Security Options:
seccomp
Profile: default
Kernel Version: 4.14.40-svn262
Operating System: Ubuntu 16.04.5 LTS
OSType: linux
Architecture: armv7l
CPUs: 1
Total Memory: 239.5 MiB
Name: IoTP
ID: YSVQ:TFGP:DMEQ:6B5R:5Z3I:6UDL:ZWLD:BZNH:CRAQ:PVKK:AQXZ:QISI
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
WARNING: No cpuset support
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false
root@IoTP:~# docker version
Client:
Version: 17.03.0-ce
API version: 1.26
Go version: go1.7.5
Git commit: 3a232c8
Built: Tue Feb 28 08:25:46 2017
OS/Arch: linux/arm

Server:
Version: 17.03.0-ce
API version: 1.26 (minimum version 1.12)
Go version: go1.7.5
Git commit: 3a232c8
Built: Tue Feb 28 08:25:46 2017
OS/Arch: linux/arm
Experimental: false

需要注意的话，虽然使用的是标准的arm ubuntu 文件系统，

但是docker的运行也是需要内核的支持的，安装成功，并不代表可以在板子上面正常运行docker images.

可以通过正规的途径来检查内核的配置：

https://github.com/moby/moby/blob/master/contrib/check-config.sh

linux-4.14.40# ./check-config.sh
info: reading kernel config from .config ...

Generally Necessary:
- cgroup hierarchy: properly mounted [/sys/fs/cgroup]
- apparmor: enabled and tools installed
- CONFIG_NAMESPACES: enabled
- CONFIG_NET_NS: enabled
- CONFIG_PID_NS: enabled
- CONFIG_IPC_NS: enabled
- CONFIG_UTS_NS: enabled
- CONFIG_CGROUPS: enabled
- CONFIG_CGROUP_CPUACCT: enabled
- CONFIG_CGROUP_DEVICE: enabled
- CONFIG_CGROUP_FREEZER: enabled
- CONFIG_CGROUP_SCHED: enabled
- CONFIG_CPUSETS: missing
- CONFIG_MEMCG: enabled
- CONFIG_KEYS: enabled
- CONFIG_VETH: missing
- CONFIG_BRIDGE: enabled
- CONFIG_BRIDGE_NETFILTER: enabled
- CONFIG_NF_NAT_IPV4: enabled
- CONFIG_IP_NF_FILTER: enabled
- CONFIG_IP_NF_TARGET_MASQUERADE: enabled
- CONFIG_NETFILTER_XT_MATCH_ADDRTYPE: enabled
- CONFIG_NETFILTER_XT_MATCH_CONNTRACK: enabled
- CONFIG_NETFILTER_XT_MATCH_IPVS: missing
- CONFIG_IP_NF_NAT: enabled
- CONFIG_NF_NAT: enabled
- CONFIG_NF_NAT_NEEDED: enabled
- CONFIG_POSIX_MQUEUE: enabled
- CONFIG_DEVPTS_MULTIPLE_INSTANCES: missing

Optional Features:
- CONFIG_USER_NS: missing
- CONFIG_SECCOMP: enabled
- CONFIG_CGROUP_PIDS: enabled
- CONFIG_MEMCG_SWAP: enabled
- CONFIG_MEMCG_SWAP_ENABLED: enabled
- CONFIG_MEMCG_KMEM: missing
- CONFIG_BLK_CGROUP: enabled
- CONFIG_BLK_DEV_THROTTLING: missing
- CONFIG_IOSCHED_CFQ: enabled
- CONFIG_CFQ_GROUP_IOSCHED: missing
- CONFIG_CGROUP_PERF: enabled
- CONFIG_CGROUP_HUGETLB: missing
- CONFIG_NET_CLS_CGROUP: missing
- CONFIG_CGROUP_NET_PRIO: missing
- CONFIG_CFS_BANDWIDTH: enabled
- CONFIG_FAIR_GROUP_SCHED: enabled
- CONFIG_RT_GROUP_SCHED: missing
- CONFIG_IP_NF_TARGET_REDIRECT: enabled
- CONFIG_IP_VS: missing
- CONFIG_IP_VS_NFCT: missing
- CONFIG_IP_VS_PROTO_TCP: missing
- CONFIG_IP_VS_PROTO_UDP: missing
- CONFIG_IP_VS_RR: missing
- CONFIG_EXT4_FS: enabled
- CONFIG_EXT4_FS_POSIX_ACL: enabled
- CONFIG_EXT4_FS_SECURITY: enabled
- Network Drivers:
- "overlay":
- CONFIG_VXLAN: missing
Optional (for encrypted networks):
- CONFIG_CRYPTO: enabled
- CONFIG_CRYPTO_AEAD: enabled
- CONFIG_CRYPTO_GCM: enabled
- CONFIG_CRYPTO_SEQIV: enabled
- CONFIG_CRYPTO_GHASH: enabled
- CONFIG_XFRM: enabled
- CONFIG_XFRM_USER: enabled (as module)
- CONFIG_XFRM_ALGO: enabled (as module)
- CONFIG_INET_ESP: enabled (as module)
- CONFIG_INET_XFRM_MODE_TRANSPORT: enabled (as module)
- "ipvlan":
- CONFIG_IPVLAN: missing
- "macvlan":
- CONFIG_MACVLAN: missing
- CONFIG_DUMMY: missing
- "ftp,tftp client in container":
- CONFIG_NF_NAT_FTP: missing
- CONFIG_NF_CONNTRACK_FTP: missing
- CONFIG_NF_NAT_TFTP: missing
- CONFIG_NF_CONNTRACK_TFTP: missing
- Storage Drivers:
- "aufs":
- CONFIG_AUFS_FS: missing
- "btrfs":
- CONFIG_BTRFS_FS: missing
- CONFIG_BTRFS_FS_POSIX_ACL: missing
- "devicemapper":
- CONFIG_BLK_DEV_DM: missing
- CONFIG_DM_THIN_PROVISIONING: missing
- "overlay":
- CONFIG_OVERLAY_FS: enabled
- "zfs":
- /dev/zfs: missing
- zfs command: missing
- zpool command: missing

Limits:
- /proc/sys/kernel/keys/root_maxkeys: 1000000

把必要的选项选上之的，就可以运行最基础的hello-world镜像了。

root@IoTP:~# docker run hello-world

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(arm32v5)
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
https://hub.docker.com/

For more examples and ideas, visit:
https://docs.docker.com/get-started/

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learning docker steps(9) ----- arm linux docker 安装

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