Table of contents
2. Use -p to specify the local port to be mapped to.
Local_Port:Container_Port, the specified port of any address
Local_IP:Local_Port:Container_Port maps to the specified port at the specified address
Local_IP::Container_Port is mapped to the specified address, but the host port is randomly assigned
3. Specify the transport protocol: TCP
Detailed docker port mapping
1. Overview of port mapping:
In Docker, the container cannot communicate with the outside by default. It is necessary to add corresponding parameters to the startup command to allow the container to communicate with the outside world.
When running a Web service in Docker, it is necessary to map the port of the Web service application in the container to the port of the local host. In this way, if the user accesses the port specified by the host machine, it is equivalent to accessing the Web service port inside the container.
2. Case experiment:
1. -P option, random port
When using
[root@docker ~]# docker run -d -P --name nginx-test1 nginx
Use docker port to view port mapping
[root@docker ~]# docker port nginx-test1
Access test: 192.168.100.131:32768
[root@docker ~]# docker logs nginx-test1
View mapped random port ranges
[root@docker ~]#
cat /proc/sys/net/ipv4/ip_local_port_range
2. Use -p to specify the local port to be mapped to.
Local_Port:Container_Port, the specified port of any address
The port mapping parameter specifies that 8000 of the host is mapped to port 80 inside the container, and the -p option can be used multiple times
[root@docker ~]# docker run -d -p 8000:80 --name nginx-test2 nginx
Access test: 192.168.100.131:8000
This method will map to all interface addresses, and all visitors can access the container through all IP ports of the host.
As follows: View the current ip address of the host
Access test: 192.168.59.153:8000
Local_IP:Local_Port:Container_Port is mapped to the specified port of the specified address
[root@docker ~]# docker run -d -p
192.168.100.131:9000:80 --name nginx-test3 nginx
Access test: 192.168.100.131:9000
Access test: 192.168.59.153:9000
Local_IP::Container_Port is mapped to the specified address, but the host port is randomly assigned
[root@docker ~]# docker run -d -p 192.168.100.131::80 --name nginx-test4 nginx
[root@docker ~]# docker port nginx-test4
Access test: 192.168.100.131:32770
3. Specify the transport protocol: TCP
[root@docker ~]# docker run -d -p 80:80/tcp --name nginx-test5 nginx
[root@docker ~]# docker port nginx-test5
Access test: 192.168.100.131:80
