Docker容器导入导出

来源：互联网发布：java中优化冒泡排序法编辑：程序博客网时间：2024/05/01 19:53

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_image6efd670bc0797350799425efd28191e53f17b494e44f92879c55dae6bf36c89f[root@entel2 docker]# docker imagesREPOSITORY                 TAG                 IMAGE ID            CREATED             VIRTUAL SIZEentel_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:/dockerroot@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 psCONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES[root@entel1 docker]# docker imagesREPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE[root@entel1 docker]# docker load --input entle_crm_image.tar [root@entel1 docker]# docker imagesREPOSITORY          TAG                 IMAGE ID            CREATED                  VIRTUAL SIZEentel_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_imageUnable to find image 'entle_crm_image:latest' locallyPulling repository entle_crm_imageGet https://index.docker.io/v1/repositories/library/entle_crm_image/images: dial tcp: lookup index.docker.io: no such host

丢，entle_crm_image 名字写错了……
也可以使用imageid来启动

[root@entel1 docker]# docker run -d --name crm 6efd670bc07939dac87560c335f0129a2c6e980b674559cdc157b74e37811e1bb7246109d169[root@entel1 docker]# docker psCONTAINER ID        IMAGE               COMMAND               CREATED             STATUS              PORTS               NAMES39dac87560c3        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 showbridge name bridge id       STP enabled interfacesdocker0     8000.56847afe9799   no  [root@entel1 ~]# brctl addbr bridge0[root@entel1 ~]# brctl showbridge name bridge id       STP enabled interfacesbridge0     8000.000000000000   no      docker0     8000.56847afe9799   no      [root@entel1 ~]# ifconfig bridge0 172.25.243.254 netmask 255.255.255.0 up[root@entel1 ~]# ifconfig bridge0bridge0   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 -nLChain 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 psCONTAINER ID        IMAGE               COMMAND               CREATED             STATUS              PORTS               NAMESf936f206d2ed        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/bashif [ -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"        exitfiCONTAINERID=$1SETIP=$2SETMASK=$3GATEWAY=$4ETHNAME=$5#verify the network card exist or notifconfig $ETHNAME > /dev/null 2>&1if [ $? -eq 0 ]; then    read -p "$ETHNAME exist,do you want delelte it? y/n " del    if [[ $del == 'y' ]]; then    ip link del $ETHNAME    else    exit    fifi#pid=`docker inspect -f '{{.State.Pid}}' $CONTAINERID`mkdir -p /var/run/netnsfind -L /var/run/netns -type l -deleteif [ -f /var/run/netns/$pid ]; then    rm -f /var/run/netns/$pidfiln -s /proc/$pid/ns/net /var/run/netns/$pid#ip link add $ETHNAME type veth peer name vethContainerbrctl addif bridge0 $ETHNAMEip link set $ETHNAME upip 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 eth0ip netns exec $pid ip link set eth0 upip netns exec $pid ip addr add $SETIP/$SETMASK dev eth0ip 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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