Ubuntu下用docker安装redis镜像和使用redis容器分享

1. 安装Ubuntu

2. 用Putty登录Ubuntu

Welcome to Ubuntu 14.04.1 LTS (GNU/Linux 3.13.0-40-generic x86_64)

 * Documentation:  https://help.ubuntu.com/

  System information as of Wed Dec 31 06:41:16 UTC 2014

  System load:  0.01              Processes:              228
  Usage of /:   6.0% of 28.80GB   Users logged in:        0
  Memory usage: 11%               IP address for eth0:    10.205.178.22
  Swap usage:   0%                IP address for docker0: 172.17.42.1

  Graph this data and manage this system at:
    https://landscape.canonical.com/

  Get cloud support with Ubuntu Advantage Cloud Guest:
    http://www.ubuntu.com/business/services/cloud

3. 拉取redis镜像

root@jumping:~# sudo docker pull redis:latest
redis:latest: The image you are pulling has been verified
eee46bd361c1: Pull complete
ff8650f588b2: Pull complete
130985f77ca0: Pull complete
4d81fff38a25: Pull complete
e6d98faa32e2: Pull complete
95d3849978c3: Pull complete
263f96794544: Pull complete
1ed9b7611cf5: Pull complete
451742990a7f: Pull complete
511136ea3c5a: Already exists
f10807909bc5: Already exists
f6fab3b798be: Already exists
1e6ac0ffed3b: Already exists
62ff5003ac9a: Already exists
e49d349e8a75: Already exists
61213f5a1710: Already exists
9feca322d1c7: Already exists
1aa8ce669b93: Already exists
Status: Downloaded newer image for redis:latest
root@jumping:~# sudo docker images
REPOSITORY                TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
redis                     latest              451742990a7f        11 days ago         111.2 MB

4. 启动redis容器

root@jumping:~# sudo docker run -t -i redis:latest
[1] 31 Dec 02:56:57.870 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
                _._
           _.-``__ ''-._
      _.-``    `.  `_.  ''-._           Redis 2.8.19 (00000000/0) 64 bit
  .-`` .-```.  ```\/    _.,_ ''-._
 (    '      ,       .-`  | `,    )     Running in stand alone mode
 |`-._`-...-` __...-.``-._|'` _.-'|     Port: 6379
 |    `-._   `._    /     _.-'    |     PID: 1
  `-._    `-._  `-./  _.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |           http://redis.io
  `-._    `-._`-.__.-'_.-'    _.-'
 |`-._`-._    `-.__.-'    _.-'_.-'|
 |    `-._`-._        _.-'_.-'    |
  `-._    `-._`-.__.-'_.-'    _.-'
      `-._    `-.__.-'    _.-'
          `-._        _.-'
              `-.__.-'

[1] 31 Dec 02:56:57.890 # Server started, Redis version 2.8.19
[1] 31 Dec 02:56:57.890 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
[1] 31 Dec 02:56:57.891 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.
[1] 31 Dec 02:56:57.891 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
[1] 31 Dec 02:56:57.891 * The server is now ready to accept connections on port 6379

5.Redis容器启动了，那接下来怎么办？

办法：把putty关了，然后从新进来putty

6. 怎么进入容器呢？

先安装NSenter：

cd /tmp; curl http://ftp.sjtu.edu.cn/sites/ftp.kernel.org/pub/linux/utils/util-linux/v2.25/util-linux-2.25.tar.gz | tar -zxf-; cd util-linux-2.25;
sudo apt-get install build-essential
sudo apt-get make
./configure --without-ncurses
make nsenter && sudo cp nsenter /usr/local/bin

方法一：

PID=$(docker inspect --format "{{ .State.Pid }}" <container>)

nsenter --target $PID --mount --uts --ipc --net --pid

方法二：

安装脚本（脚本参照：https://github.com/jpetazzo/nsenter/blob/master/docker-enter）

wget -P ~ https://github.com/yeasy/docker_practice/raw/master/_local/.bashrc_docker;

echo "[ -f ~/.bashrc_docker ] && . ~/.bashrc_docker" >> ~/.bashrc; source ~/.bashrc

最后，调用docker-enter进入容器：

root@jumping:/tmp# docker-enter b430d6f4ff00 ls
dirname: invalid option -- 's'
Try 'dirname --help' for more information.
bin  boot  data  dev  entrypoint.sh  etc  home  lib  lib64  media  mnt  opt  proc  root  run  sbin  selinux  srv  sys  tmp  usr  var
root@b430d6f4ff00:~#

注：这里大家看到有错误，是因为脚本中用到$(dirname "$0"")， 大家可以直接echo "$0"，我这边显示的是-su

7. 测试redis命令

进入容器后可以用redis-cli ping测试可以连接上本机刚才启动的redis-server不，返回PONG说明连接成功。

直接按redis-cli进入redis 命令测试下可以用不：

root@816ebd247014:~# redis-cli ping
PONG
root@816ebd247014:~# redis-cli
127.0.0.1:6379> set myname jumping
OK
127.0.0.1:6379> get myname
"jumping"
127.0.0.1:6379>

8. 这样就简单的把redis启动起来了，要用起来大家还要把端口影射到宿主机器上，然后可以通过客户端来调用Redis:http://redis.io/clients