Docker容器导入导出

概述

需要重新部署197主机环境,copy198的镜像 进行迁移。

将容器comit成镜像,使用save和load进行镜像迁移,最后根据镜像启动容器。

步骤

198主机上的操作:

[root@entel2 docker]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
………………………..
ec1f968cc0d0 entel_base_image:withtt_oracle “/usr/sbin/sshd -D” 12 weeks ago Up 4 weeks crm
………………………..

1.停止容器(也可以不停止,只要下一步commit成功即可)

[root@entel2 docker]# docker stop crm 
crm

2.将容器commit为镜像

[root@entel2 docker]# docker commit ec1f968cc0d0 entel_crm_image
6efd670bc0797350799425efd28191e53f17b494e44f92879c55dae6bf36c89f

[root@entel2 docker]# docker images
REPOSITORY                 TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
entel_crm_image            latest              6efd670bc079        17 seconds ago      8.335 GB

3.save镜像为tar文件

[root@entel2 docker]# docker save -o /docker/entle_crm_image.tar entel_crm_image
[root@entel2 docker]# cd /docker
[root@entel2 docker]# du -sh entle_crm_image.tar 
7.8G    entle_crm_image.tar

4.将tar文件scp到 目标docker主机

[root@entel2 docker]# scp entle_crm_image.tar root@10.45.7.197:/docker
root@10.45.7.197's password: entle_crm_image.tar 100% 7980MB 96.2MB/s 01:23 

197主机上的操作

5.在目标主机docker load导入

[root@entel1 docker]# cd /docker
[root@entel1 docker]# du -sh entle_crm_image.tar 
7.8G    entle_crm_image.tar
[root@entel1 docker]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[root@entel1 docker]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE

[root@entel1 docker]# docker load --input entle_crm_image.tar 
[root@entel1 docker]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED                  VIRTUAL SIZE
entel_crm_image     latest              6efd670bc079        Less than a second ago   8.335 GB

load成功

6.目标主机启动容器

[root@entel1 docker]# docker run -d --name crm entle_crm_image
Unable to find image 'entle_crm_image:latest' locally
Pulling repository entle_crm_image
Get https://index.docker.io/v1/repositories/library/entle_crm_image/images: dial tcp: lookup index.docker.io: no such host

解决:换成imageid

[root@entel1 docker]# docker run -d --name crm 6efd670bc079
39dac87560c335f0129a2c6e980b674559cdc157b74e37811e1bb7246109d169
[root@entel1 docker]# docker ps
CONTAINER ID        IMAGE               COMMAND               CREATED             STATUS              PORTS               NAMES
39dac87560c3        6efd670bc079        "/usr/sbin/sshd -D"   34 seconds ago      Up 33 seconds       8080/tcp            crm

这种方式创建的 ,默认分配的IP,我们想手动分配IP ,所以
先停止crm,然后 移除crm容器

[root@entel1 ~]# docker stop crm 
[root@entel1 ~]# docker rm crm 

再重新创建容器,使用如下命令:

[root@entel1 ~]# docker run -it -d --ipc=host -h=crm --name crm --net=none entel_crm_image  /usr/sbin/sshd -D 
f936f206d2ed9c9e1a7773a5be9b5d9a634ddb8ac46034d78df9a1a7d417625e

7 为宿主机新增一个网桥bridge0,并且配置iptables

[root@entel1 ~]# brctl show
bridge name bridge id       STP enabled interfaces
docker0     8000.56847afe9799   no  


[root@entel1 ~]# brctl addbr bridge0


[root@entel1 ~]# brctl show
bridge name bridge id       STP enabled interfaces
bridge0     8000.000000000000   no      
docker0     8000.56847afe9799   no      


[root@entel1 ~]# ifconfig bridge0 172.25.243.254 netmask 255.255.255.0 up


[root@entel1 ~]# ifconfig bridge0
bridge0   Link encap:Ethernet  HWaddr 1E:0D:4A:6A:C8:82  
          inet addr:172.25.243.254  Bcast:172.25.243.255  Mask:255.255.255.0
          inet6 addr: fe80::884a:45ff:fede:17a9/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:5058725 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8036183 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:3775394468 (3.5 GiB)  TX bytes:7018918104 (6.5 GiB)

[root@entel1 ~]# iptables -t nat -A PREROUTING -p tcp -d 10.45.7.197 --dport 21205 -j DNAT --to-destination 172.25.243.103 :22


[root@entel1 ~]# service iptables save


[root@entel1 ~]# iptables -t nat -nL
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination         
DOCKER     all  --  0.0.0.0/0            0.0.0.0/0           ADDRTYPE match dst-type LOCAL 
DNAT       tcp  --  0.0.0.0/0            10.45.7.197         tcp dpt:21205 to:192.168.123.205:22 

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
DOCKER     all  --  0.0.0.0/0           !127.0.0.0/8         ADDRTYPE match dst-type LOCAL 

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         
MASQUERADE  all  --  172.17.0.0/16        0.0.0.0/0           
MASQUERADE  all  --  172.17.0.0/16        0.0.0.0/0           
MASQUERADE  all  --  172.17.0.0/16        0.0.0.0/0           

Chain DOCKER (2 references)
target     prot opt source               destination         
[root@entel1 ~]# 

8 调用脚本手工分配IP

[root@entel1 ~]# docker ps
CONTAINER ID        IMAGE               COMMAND               CREATED             STATUS              PORTS               NAMES
f936f206d2ed        entel_crm_image     "/usr/sbin/sshd -D"   20 minutes ago      Up 20 minutes                           crm                 
[root@entel1 ~]# ./manual_config_static_ip.sh f936f206d2ed 172.25.243.103 24 172.25.243.254 crm

manual_config_static_ip.sh

#!/bin/bash
if [ -z $1 ] || [ -z $2 ] || [ -z $3 ] || [ -z $4 ] || [ -z $5 ];
then
        echo "*****Input the necessary parameters: CONTAINERID IP MASK GATEWAY ETHNAME"
        echo "*****Call the script like: sh manual_con_static_ip.sh b0e18b6a4432 192.168.5.123 24 192.168.5.1 deth0"
        exit
fi

CONTAINERID=$1
SETIP=$2
SETMASK=$3
GATEWAY=$4
ETHNAME=$5

#verify the network card exist or not
ifconfig $ETHNAME > /dev/null 2>&1
if [ $? -eq 0 ]; then
    read -p "$ETHNAME exist,do you want delelte it? y/n " del
    if [[ $del == 'y' ]]; then
    ip link del $ETHNAME
    else
    exit
    fi
fi
#
pid=`docker inspect -f '{{.State.Pid}}' $CONTAINERID`
mkdir -p /var/run/netns
find -L /var/run/netns -type l -delete

if [ -f /var/run/netns/$pid ]; then
    rm -f /var/run/netns/$pid
fi
ln -s /proc/$pid/ns/net /var/run/netns/$pid
#
ip link add $ETHNAME type veth peer name vethContainer
brctl addif bridge0 $ETHNAME
ip link set $ETHNAME up
ip link set vethContainer netns $pid
#
ip netns exec $pid ip link del eth0 > /dev/null 2>&1
#
ip netns exec $pid ip link set dev vethContainer name eth0
ip netns exec $pid ip link set eth0 up
ip netns exec $pid ip addr add $SETIP/$SETMASK dev eth0
ip netns exec $pid ip route add default via $GATEWAY

第二种方式 export

将容器export为tar文件,然后目标主机import为镜像,最后使用镜像启动容器

这个方法,启动容器时,默认并不会启动程序,需启动容器时加启动参数。

经常会出现问题,不建议使用该方法。

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