How docker dynamically modifies container port mapping

docker dynamically modifies container port


Docker Port mapping is often Docker Run By order -p Map the internal port of the container to the specified port of the host , Generally speaking, the port corresponding to the port of the container is determined in advance to be mapped . But in some cases you have to map ports temporarily , for example Docker It's running in the air MySQL Containers , The default port is not open . So what is the way to make the running container expose the specified port ? My guest, please look down --->

Method 1 : change Docker The configuration file ( There are risks )

By modifying the Docker To achieve our goal , Generally speaking, the following files need to be modified config.v2.json and hostconfig.json. The default path is /var/lib/docker/containers/< Container name >.

First, through systemctl stop docker close Docker service , Second, revise config.v2.json Of documents ExposedPorts Configuration information to add container internal ports, such as "8080/tcp":{}, And then modify hostconfig.json Medium PortBindings Configuration information is shown below .

After completing the above configuration systemctl restart docker restart docker service , And restart the specified container to access the corresponding port .( This method has risks and is not recommended for frequent use )

 "Config": {
"ExposedPorts": {
// Add internal ports 5432 mapping
"5432/tcp": {},
"8080/tcp": {}
},s
...
},
"PortBindings":{
// Add internal ports and external ports 15432
"5432/tcp":[
{
"HostIp":"",
"HostPort":"15432"
}
],
"8080/tcp":[
{
"HostIp":"",
"HostPort":"28080"
}
]
},

Method 2 :Iptables Port forwarding

Docker The principle of network port mapping is through Iptables Implement port forwarding , Based on this principle, we can directly use iptables Forward port to destination container Ip On . Port forwarding can be realized through the following command . This approach depends on Iptables The rules of , Some scenarios may lead to Iptables The rules of the container conflict, which affects the effective start of the container .

# Port mapping
iptables -t nat -A DOCKER -p tcp --dport < Container external port > -j DNAT --to-destination < Containers ip>:< Internal port of container >
# Cancel port mapping rule
iptables -t nat -D DOCKER -p tcp -d 0/0 --dport < Container external port > -j DNAT --to-destination < Containers ip>:< Internal port of container >
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