过完年了，快1个月没有写博客，现在给大家分享一下我是如何在单机环境，实现持久化固定容器IP。
我是去年6月份开始玩docker，到现在已经9个月了，docker的最新版本也到了1.5.目前我这里对docker已经放到测试环境给研发使用，目前感觉最大的问题就是容器手动重启或者异常关闭后在启动容器，那么容器的ip就回变化（这个是使用默认的docker0做桥接），如果使用pipework手动配置ip，也得重新在来一遍，很是麻烦，所以我写了一个程序来自动化的解决这个问题。
一、程序介绍
使用到的程序有2个：
1、创建容器程序，名字是create_docker_container_use_static_ip.sh,使用shell脚本编写。
2、监控容器状态并自动给重启没有ip的容器设置ip，名字是auto_check_modify_container.py，使用python编写。
创建容器程序的逻辑：
1、运行创建脚本来创建docker container；
2、创建的信息会写入到etcd里进行保存；
3、根据配置信息来创建具体的container。
其中我程序使用openvswitch来坐桥接，并对不同vlan做不同的网段设置。
监控容器并给自动重启设置ip程序逻辑：
1、从etcd里获取容器的信息；
2、根据第一步的信息，进行nmap扫描ssh服务是否启动，未启动的转给下一步；
3、收到上一步的ip，然后根据etcd的容器信息进行重新pipework配置之前的固定ip。
下面是创建容器程序脚本内容
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#!/bin/bash
#author:Deng Lei
#email: dl528888@gmail.com
#this script is create new docker container and use pipework add static ip,when container is restart,it also use last static ip
container=$1
images=$2
daemon_program=$3
vlan_tag=$4
#ip_pool='172.16.10.1/24'
bridge=ovs2
default_vlan=1
default_vlan_ip=
'172.16.0.1/24'
email=
'244979152@qq.com'
local_ip=`
/sbin/ifconfig
|
grep
'inet'
|
grep
-Ev
'(127|117|211|172|::1|fe)'
|
awk
'{print $2}'
|
head
-n 1`
if
[ -z $1 ] || [ -z $2 ];
then
echo
"Usage: container_name container_image vlan_tag(default:1)"
echo
"Example: I want create new docker container test1 centos6:latest supervisord vlan 100"
echo
"The command is: bash `basename $0` test1 centos6:latest supervisord 100"
exit
1
fi
[ `docker
ps
-a|
grep
-
v
"NAMES"
|
awk
'{print $NF}'
|
grep
"$container"
&>>
/dev/null
&&
echo
0 ||
echo
1` -
eq
0 ] &&
echo
"The container $container is exist!"
&&
exit
1
[ `
which
pipework &>
/dev/null
&&
echo
0||
echo
1` -
eq
1 ] &&
echo
"I can't find pipework,please install it!"
&&
exit
1
if
[ -z $3 ];
then
vlan_tag=${default_vlan}
fi
#create new docker container
docker run --restart always -d --net=
"none"
--name=
"$container"
$images $daemon_program &>>
/dev/null
#check openvswitch bridge exist
if
[ `ovs-vsctl list-br |
grep
${bridge} &>
/dev/null
&&
echo
0||
echo
1` -
eq
1 ];
then
ovs-vsctl add-br ${bridge}
fi
#set up default vlan info
check_default_vlan_exist=`etcdctl get
/app/docker/
${local_ip}
/vlan
${default_vlan}
/gateway
2>
/dev/null
||
echo
1`
if
[ ${check_default_vlan_exist} =
"1"
];
then
ovs-vsctl add-port $bridge vlan${default_vlan} tag=${default_vlan} --
set
interface vlan${default_vlan}
type
=internal
#ifconfig vlan${default_vlan} ${default_vlan_ip}
ip link
set
vlan${default_vlan} up
ip addr add $default_vlan_ip dev vlan${default_vlan}
etcdctl
set
/app/docker/
${local_ip}
/vlan
${default_vlan}
/nowip
$default_vlan_ip &>>
/dev/null
etcdctl
set
/app/docker/
${local_ip}
/vlan
${default_vlan}
/gateway
$default_vlan_ip &>>
/dev/null
etcdctl
set
/app/docker/now_vlan_ip
$default_vlan_ip &>>
/dev/null
fi
#set up new vlan info
new_vlan_gateway_ip=`etcdctl get
/app/docker/
${local_ip}
/vlan
${vlan_tag}
/gateway
2>
/dev/null
||
echo
1`
if
[ ${new_vlan_gateway_ip} =
"1"
];
then
sleep
1
now_vlan_ip=`etcdctl get
/app/docker/now_vlan_ip
`
new_vlan_ip=$(
awk
-
v
new_ip=`
echo
$now_vlan_ip|
cut
-d/ -f 1|
awk
-F
'.'
'{print $1"."$2"."$3+1"."$4}'
` -
v
new_ip_netmask=`
echo
$now_vlan_ip|
cut
-d/ -f2`
'BEGIN{print new_ip"/"new_ip_netmask}'
)
ovs-vsctl add-port $bridge vlan${vlan_tag} tag=${vlan_tag} --
set
interface vlan${vlan_tag}
type
=internal
ip link
set
vlan${vlan_tag} up
ip addr add ${new_vlan_ip} dev vlan${vlan_tag}
# ifconfig vlan${vlan_tag} ${new_vlan_ip}
etcdctl
set
/app/docker/now_vlan_ip
${new_vlan_ip} &>>
/dev/null
etcdctl
set
/app/docker/
${local_ip}
/vlan
${vlan_tag}
/gateway
${new_vlan_ip} &>>
/dev/null
etcdctl
set
/app/docker/
${local_ip}
/vlan
${vlan_tag}
/nowip
${new_vlan_ip} &>>
/dev/null
new_vlan_gateway_ip=${new_vlan_ip}
fi
#calculate new ip
sleep
1
now_container_ip=`etcdctl get
/app/docker/
${local_ip}
/vlan
${vlan_tag}
/nowip
`
echo
"now container ip is:$now_container_ip"
new_container_ip=$(
awk
-
v
new_ip=`
echo
$now_container_ip|
cut
-d/ -f 1|
awk
-F
'.'
'{print $1"."$2"."$3"."$4+1}'
` -
v
new_ip_netmask=`
echo
$now_container_ip|
cut
-d/ -f2`
'BEGIN{print new_ip"/"new_ip_netmask}'
)
etcdctl
set
/app/docker/
${local_ip}
/vlan
${vlan_tag}
/nowip
$new_container_ip &>
/dev/null
echo
"finish calculate new ip!"
create_time=`
date
+
"%Y-%m-%d %T"
`
`
which
pipework` $bridge $container ${new_container_ip}@`
echo
${new_vlan_gateway_ip}|
awk
-F
'/'
'{print $1}'
` @${vlan_tag}
etcdctl
set
/app/docker/
${local_ip}
/vlan
${vlan_tag}
/container/
${container}
"{'Physics_ip':'${local_ip}','Container_name':'${container}','Container_ip':'${new_container_ip}','Container_vlan':'${vlan_tag}','Container_vlan_gateway':'${new_vlan_gateway_ip}','Container_create':'${create_time}','Container_status':'running'}"
|
注意：如果想使用本程序，客户端必须安装openvswitch、etcd与etcdctl、pipework。
监控容器并给自动重启设置ip程序脚本内容：
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#!/usr/bin/env python
#author:Deng Lei
#email: dl528888@gmail.com
import
sys
import
nmap
import
multiprocessing
import
time
import
socket, struct, fcntl
import
etcd
import
re
from docker
import
Client
import
subprocess
def get_local_ip(iface =
'em1'
):
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sockfd = sock.fileno()
SIOCGIFADDR = 0x8915
ifreq = struct.pack(
'16sH14s'
, iface, socket.AF_INET,
'\x00'
*14)
try:
res = fcntl.ioctl(sockfd, SIOCGIFADDR, ifreq)
except:
return
None
ip = struct.unpack(
'16sH2x4s8x'
, res)[2]
return
socket.inet_ntoa(ip)
def get_etcd_info(key):
etcd_result=[]
r = etcd_client.
read
(
'%s%s'
%(docker_etcd_key,local_ip), recursive=True, sorted=True)
for
child
in
r.children:
if
child.
dir
is not True and
"Container_name"
in
child.value:
etcd_result.append(child.value)
return
etcd_result
def check_by_nmap(ip,port):
check_result=len(nm.scan(
'%s'
%ip,
'%s'
%port)[
'scan'
])
if
check_result == 0:
msg=
'%s'
%(ip)
return
msg
def docker_container_stop():
docker_container=docker_client.containers(all=True)
container_name=[]
container_stop_name=[]
for
i
in
docker_container:
if
re.match(
'Exited'
,i[
'Status'
]):
container_name.append(i[
'Names'
])
for
b
in
container_name:
for
c
in
b:
container_stop_name.append(c)
return
container_stop_name
def docker_container_all():
docker_container=docker_client.containers(all=True)
container_name=[]
container_stop_name=[]
for
i
in
docker_container:
container_name.append(i[
'Names'
])
for
b
in
container_name:
for
c
in
b:
container_stop_name.append(c)
return
container_stop_name
if
__name__ ==
"__main__"
:
nm = nmap.PortScanner()
etcd_client=etcd.Client(host=
'127.0.0.1'
, port=4001)
docker_client = Client(base_url=
'unix://var/run/docker.sock'
, version=
'1.15'
, timeout=10)
local_ip=get_local_ip(
'ovs1'
)
bridge=
'ovs2'
docker_etcd_key=
'/app/docker/'
port=
'22'
ip_list=[]
now_etcd_result=get_etcd_info(docker_etcd_key)
docker_container_stop_name=docker_container_stop()
docker_container_all_name=docker_container_all()
for
i
in
range(len(now_etcd_result)):
now_info=
eval
(now_etcd_result[i])
key=
'%s%s/vlan%s/container/%s'
%(docker_etcd_key,local_ip,now_info[
'Container_vlan'
],now_info[
'Container_name'
])
if
'/'
+now_info[
'Container_name'
] not
in
docker_container_stop_name and now_info[
'Container_status'
] !=
'delete'
:
ip_list.append(
eval
(now_etcd_result[i])[
'Container_ip'
].
split
(
'/'
)[0])
if
now_info[
'Container_status'
] ==
'stop'
:
now_info[
'Container_status'
]=
'running'
etcd_client.write(key,now_info)
else
:
now_info[
'Container_status'
]=
'stop'
etcd_client.write(key,now_info)
if
'/'
+now_info[
'Container_name'
] not
in
docker_container_all_name:
print
'%s %s will delete,because docker client had deleted!'
%(
time
.strftime(
'%Y-%m-%d %T'
),key)
now_info[
'Container_status'
]=
'delete'
etcd_client.write(key,now_info)
ip_list=list(
set
(ip_list))
if
len(ip_list) == 1:
num=1
elif
len(ip_list)>=4 and len(ip_list)<=8:
num=4
elif
len(ip_list) >8 and len(ip_list)<=20:
num=8
else
:
num=15
pool = multiprocessing.Pool(processes=num)
scan_result=[]
for
i
in
ip_list:
pool.apply_async(check_by_nmap, (i,port, ))
scan_result.append(pool.apply_async(check_by_nmap, (i,port, )))
pool.close()
pool.
join
()
result=[]
for
res
in
scan_result:
if
res.get() is not None:
result.append(res.get())
result=list(
set
(result))
if
len(result) <= 0:
print
'%s Everything is all right!'
%
time
.strftime(
'%Y-%m-%d %T'
)
sys.
exit
(1)
else
:
print
'%s container need modify container static ip is:%s'
%(
time
.strftime(
'%Y-%m-%d %T'
),result)
for
i
in
range(len(now_etcd_result)):
now_info=
eval
(now_etcd_result[i])
if
(now_info[
'Container_ip'
]).
split
(
'/'
)[0]
in
result:
modify_container=subprocess.Popen(
"`which pipework` %s %s %s@%s @%s &>>/dev/null && echo 0 || echo 1"
%(bridge,now_info[
'Container_name'
],now_info[
'Container_ip'
],now_info[
'Container_vlan_gateway'
].
split
(
'/'
)[0],now_info[
'Container_vlan'
]),shell=True,stdout=subprocess.PIPE)
if
(modify_container.stdout.readlines()[0]).strip(
'\n'
) == 0:
print
'container_name:%s container_ip:%s modify static ip is fail!'
%(now_info[
'Container_name'
],now_info[
'Container_ip'
])
else
:
print
'container_name:%s container_ip:%s modify static ip is success!'
%(now_info[
'Container_name'
],now_info[
'Container_ip'
])
|
注意：使用本脚本必须安装nmap、etcd、docker模块。
其中python里nmap的安装方法是
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1
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easy_install python-nmap
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其中python里etcd的安装方法是
安装基础库
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1
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yum
install
libffi libffi-devel python-devel
|
安装程序
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1
2
3
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git clone https:
//github
.com
/jplana/python-etcd
.git
cd
python-etcd
python setup.py
install
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其中python里docker的安装方法是
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1
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easy_install docker-py
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二、效果展示
需求：
创建主机test1、test2、test3、test4，需要test1与test2属于vlan100，test3与test4属于vlan300，架构图如下
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ovs2
|
|
-----------------
| |
| |
vlan100(tag100) vlan300(tag300)
| |
| |
----------- ----------------------
| | | |
| | | |
test1 test2 test3 test4
(tag100) (tag100) (tag300) (tag300)
|
下面是操作
1、创建ovs1、ovs2网桥，其中em1绑定到ovs1走内网，ovs2是容器的网络
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ovs-vsctl add-br ovs1
ovs-vsctl add-br ovs2
ovs-vsctl add-port ovs1 em1
ip link
set
ovs1 up
ifconfig
em1 0
ifconfig
ovs1 10.10.17.3
|
2、创建test1、test2、test3、test4的容器
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[root@docker-test3 ~]
# sh create_docker_container_use_static_ip.sh test1 docker.ops-chukong.com:5000/centos6-http:new /usr/bin/supervisord 100
{
'Physics_ip'
:
'10.10.17.3'
,
'Container_name'
:
'test1'
,
'Container_ip'
:
'172.16.1.2/24'
,
'Container_vlan'
:
'100'
,
'Container_vlan_gateway'
:
'172.16.1.1/24'
,
'Container_create'
:
'2015-03-02 14:59:59'
,
'Container_status'
:
'running'
}
[root@docker-test3 ~]
# sh create_docker_container_use_static_ip.sh test2 docker.ops-chukong.com:5000/centos6-http:new /usr/bin/supervisord 100
{
'Physics_ip'
:
'10.10.17.3'
,
'Container_name'
:
'test2'
,
'Container_ip'
:
'172.16.1.3/24'
,
'Container_vlan'
:
'100'
,
'Container_vlan_gateway'
:
'172.16.1.1/24'
,
'Container_create'
:
'2015-03-02 15:00:09'
,
'Container_status'
:
'running'
}
[root@docker-test3 ~]
# sh create_docker_container_use_static_ip.sh test3 docker.ops-chukong.com:5000/centos6-http:new /usr/bin/supervisord 300
{
'Physics_ip'
:
'10.10.17.3'
,
'Container_name'
:
'test3'
,
'Container_ip'
:
'172.16.2.2/24'
,
'Container_vlan'
:
'300'
,
'Container_vlan_gateway'
:
'172.16.2.1/24'
,
'Container_create'
:
'2015-03-02 15:00:22'
,
'Container_status'
:
'running'
}
[root@docker-test3 ~]
# sh create_docker_container_use_static_ip.sh test4 docker.ops-chukong.com:5000/centos6-http:new /usr/bin/supervisord 300
{
'Physics_ip'
:
'10.10.17.3'
,
'Container_name'
:
'test4'
,
'Container_ip'
:
'172.16.2.3/24'
,
'Container_vlan'
:
'300'
,
'Container_vlan_gateway'
:
'172.16.2.1/24'
,
'Container_create'
:
'2015-03-02 15:00:31'
,
'Container_status'
:
'running'
}
|
这个脚本第一个参数是创建的容器名，第二个参数是docker images，第三个参数是运行命令，第四个参数是vlan。
下面是当前docker信息
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[root@docker-test3 ~]
# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
386b4180b3d0 docker.ops-chukong.com:5000
/centos6-http
:new "
/usr/bin/supervisor
About a minute ago Up About a minute test4
92fee54ec498 docker.ops-chukong.com:5000
/centos6-http
:new "
/usr/bin/supervisor
About a minute ago Up About a minute test3
4dc84301894a docker.ops-chukong.com:5000
/centos6-http
:new "
/usr/bin/supervisor
About a minute ago Up About a minute test2
45d4a73c6ed0 docker.ops-chukong.com:5000
/centos6-http
:new "
/usr/bin/supervisor
2 minutes ago Up 2 minutes test1
|
下面是openvswitch的信息
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[root@docker-test3 ~]
# ovs-vsctl show
d895d78b-8c89-49bc-b429-da6a4a2dcb3a
Bridge
"ovs2"
Port
"vlan300"
tag: 300
Interface
"vlan300"
type
: internal
Port
"ovs2"
Interface
"ovs2"
type
: internal
Port
"veth1pl11491"
tag: 100
Interface
"veth1pl11491"
Port
"veth1pl12003"
tag: 300
Interface
"veth1pl12003"
Port
"vlan100"
tag: 100
Interface
"vlan100"
type
: internal
Port
"veth1pl12251"
tag: 300
Interface
"veth1pl12251"
Port
"veth1pl11788"
tag: 100
Interface
"veth1pl11788"
Port
"vlan1"
tag: 1
Interface
"vlan1"
type
: internal
Bridge
"ovs1"
Port
"em1"
Interface
"em1"
Port
"ovs1"
Interface
"ovs1"
type
: internal
ovs_version:
"2.3.1"
|
下面是etcd的信息
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[root@docker-test3 ~]
# etcdctl ls / --recursive|grep docker|grep "10.10.17.3/"
/app/docker/ip/vlan/10
.10.17.3
/gate_way
/app/docker/ip/vlan/10
.10.17.3
/now_ip
/app/docker/10
.10.17.3
/vlan300
/app/docker/10
.10.17.3
/vlan300/container
/app/docker/10
.10.17.3
/vlan300/container/test3
/app/docker/10
.10.17.3
/vlan300/container/test4
/app/docker/10
.10.17.3
/vlan300/gateway
/app/docker/10
.10.17.3
/vlan300/nowip
/app/docker/10
.10.17.3
/vlan1
/app/docker/10
.10.17.3
/vlan1/gateway
/app/docker/10
.10.17.3
/vlan1/nowip
/app/docker/10
.10.17.3
/vlan100
/app/docker/10
.10.17.3
/vlan100/gateway
/app/docker/10
.10.17.3
/vlan100/nowip
/app/docker/10
.10.17.3
/vlan100/container
/app/docker/10
.10.17.3
/vlan100/container/test1
/app/docker/10
.10.17.3
/vlan100/container/test2
|
查看test1的信息
|
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2
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[root@docker-test3 ~]
# etcdctl get /app/docker/10.10.17.3/vlan100/container/test1
{
'Physics_ip'
:
'10.10.17.3'
,
'Container_name'
:
'test1'
,
'Container_ip'
:
'172.16.1.2/24'
,
'Container_vlan'
:
'100'
,
'Container_vlan_gateway'
:
'172.16.1.1/24'
,
'Container_create'
:
'2015-03-02 14:59:59'
,
'Container_status'
:
'running'
}
|
跟创建容器的信息一样
进入容器，然后查看设置ip情况
|
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[root@docker-test3 ~]
# docker exec test1 ifconfig eth1|grep "inet addr"
inet addr:172.16.1.2 Bcast:0.0.0.0 Mask:255.255.255.0
[root@docker-test3 ~]
# docker exec test2 ifconfig eth1|grep "inet addr"
inet addr:172.16.1.3 Bcast:0.0.0.0 Mask:255.255.255.0
[root@docker-test3 ~]
# docker exec test3 ifconfig eth1|grep "inet addr"
inet addr:172.16.2.2 Bcast:0.0.0.0 Mask:255.255.255.0
[root@docker-test3 ~]
# docker exec test4 ifconfig eth1|grep "inet addr"
inet addr:172.16.2.3 Bcast:0.0.0.0 Mask:255.255.255.0
|
可以看到ip都是之前设置的
然后在test1里ping外网与test2
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14
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[root@docker-test3 ~]
# docker exec test1 ping -c1 www.baidu.com
PING www.a.shifen.com (180.149.131.205) 56(84) bytes of data.
64 bytes from 180.149.131.205: icmp_seq=1 ttl=54
time
=1.94 ms
--- www.a.shifen.com
ping
statistics ---
1 packets transmitted, 1 received, 0% packet loss,
time
12ms
rtt min
/avg/max/mdev
= 1.948
/1
.948
/1
.948
/0
.000 ms
[root@docker-test3 ~]
# docker exec test1 ping -c1 172.16.1.3
PING 172.16.1.3 (172.16.1.3) 56(84) bytes of data.
64 bytes from 172.16.1.3: icmp_seq=1 ttl=64
time
=0.431 ms
--- 172.16.1.3
ping
statistics ---
1 packets transmitted, 1 received, 0% packet loss,
time
0ms
rtt min
/avg/max/mdev
= 0.431
/0
.431
/0
.431
/0
.000 ms
|
可以看到都是通的
在从test3里ping外网与test4
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|
[root@docker-test3 ~]
# docker exec test3 ping -c1 www.baidu.com
PING www.a.shifen.com (180.149.131.236) 56(84) bytes of data.
64 bytes from 180.149.131.236: icmp_seq=1 ttl=54
time
=2.19 ms
--- www.a.shifen.com
ping
statistics ---
1 packets transmitted, 1 received, 0% packet loss,
time
12ms
rtt min
/avg/max/mdev
= 2.197
/2
.197
/2
.197
/0
.000 ms
[root@docker-test3 ~]
# docker exec test3 ping -c1 172.16.2.3
PING 172.16.2.3 (172.16.2.3) 56(84) bytes of data.
64 bytes from 172.16.2.3: icmp_seq=1 ttl=64
time
=0.504 ms
--- 172.16.2.3
ping
statistics ---
1 packets transmitted, 1 received, 0% packet loss,
time
0ms
rtt min
/avg/max/mdev
= 0.504
/0
.504
/0
.504
/0
.000 ms
|
也是通的
3、关闭test1并测试
|
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[root@docker-test3 ~]
# docker stop test1
test1
[root@docker-test3 ~]
# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
386b4180b3d0 docker.ops-chukong.com:5000
/centos6-http
:new "
/usr/bin/supervisor
12 minutes ago Up 12 minutes test4
92fee54ec498 docker.ops-chukong.com:5000
/centos6-http
:new "
/usr/bin/supervisor
12 minutes ago Up 12 minutes test3
4dc84301894a docker.ops-chukong.com:5000
/centos6-http
:new "
/usr/bin/supervisor
12 minutes ago Up 12 minutes test2
45d4a73c6ed0 docker.ops-chukong.com:5000
/centos6-http
:new "
/usr/bin/supervisor
12 minutes ago Exited (0) 2 seconds ago test1
[root@docker-test3 ~]
# ping -c2 172.16.1.2
PING 172.16.1.2 (172.16.1.2) 56(84) bytes of data.
--- 172.16.1.2
ping
statistics ---
2 packets transmitted, 0 received, 100% packet loss,
time
999ms
|
可以看到test1关闭了，给予的ip也不能通了，下面启动容器，然后使用我自动检测与重新设置容器ip
|
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|
[root@docker-test3 ~]
# docker start test1
test1
[root@docker-test3 ~]
# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
386b4180b3d0 docker.ops-chukong.com:5000
/centos6-http
:new "
/usr/bin/supervisor
13 minutes ago Up 13 minutes test4
92fee54ec498 docker.ops-chukong.com:5000
/centos6-http
:new "
/usr/bin/supervisor
13 minutes ago Up 13 minutes test3
4dc84301894a docker.ops-chukong.com:5000
/centos6-http
:new "
/usr/bin/supervisor
13 minutes ago Up 13 minutes test2
45d4a73c6ed0 docker.ops-chukong.com:5000
/centos6-http
:new "
/usr/bin/supervisor
13 minutes ago Up 2 seconds test1
[root@docker-test3 ~]
# python auto_check_modify_container.py
2015-03-02 15:14:03 container need modify container static ip is:[
'172.16.1.2'
]
container_name:test1 container_ip:172.16.1.2
/24
modify static ip is success!
|
可以看到启动容器后，程序自动搜集之前的ip信息，并重新配置了
在test1里测试
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|
[root@docker-test3 ~]
# docker exec test1 ifconfig eth1|grep "inet addr"
inet addr:172.16.1.2 Bcast:0.0.0.0 Mask:255.255.255.0
[root@docker-test3 ~]
# docker exec test1 ping -c1 www.baidu.com
PING www.a.shifen.com (180.149.131.236) 56(84) bytes of data.
64 bytes from 180.149.131.236: icmp_seq=1 ttl=54
time
=2.18 ms
--- www.a.shifen.com
ping
statistics ---
1 packets transmitted, 1 received, 0% packet loss,
time
12ms
rtt min
/avg/max/mdev
= 2.183
/2
.183
/2
.183
/0
.000 ms
[root@docker-test3 ~]
# docker exec test1 ping -c1 172.16.1.3
PING 172.16.1.3 (172.16.1.3) 56(84) bytes of data.
64 bytes from 172.16.1.3: icmp_seq=1 ttl=64
time
=0.382 ms
--- 172.16.1.3
ping
statistics ---
1 packets transmitted, 1 received, 0% packet loss,
time
0ms
rtt min
/avg/max/mdev
= 0.382
/0
.382
/0
.382
/0
.000 ms
|
测试都没有问题
大家以后使用的时候，可以先使用我的程序创建容器，然后把检测程序放到crontab里，每分钟自动运行，这样就能实现持久化固定ip。
本文转自 reinxu 51CTO博客，原文链接：http://blog.51cto.com/dl528888/1616527，如需转载请自行联系原作者
