Host Network Sharing Mode

In the host network sharing mode, containers can directly use the network stack of the host. In Docker, the creation of an Nginx container that utilizes the host network sharing mode has implemented efficient communication between the container and the host network.

In CentOS or openEuler, to create and run a container connected to the Docker host network stack, perform the following steps:

1. Create a container.
   • CentOS:

     1	docker run -itd --privileged -v /home/share/:/home/share/ --cpuset-cpus 0-1 --cpuset-mems 0 --memory 8589934592 --net=host --name nginx_1 arm/centos7/nginx:http /bin/bash

   • openEuler:

     1	docker run -itd --privileged -v /home/share/:/home/share/ --cpuset-cpus 0-1 --cpuset-mems 0 --memory 8589934592 --net=host --name nginx_1 arm/openeuler20/nginx:http /bin/bash

   For details about the command description, see Table 1.

   Table 1 Command description

   Command	Description
   -v	Specifies a shared directory.
   --cpuset-cpus	Specifies the physical cores allocated to the container.
   --cpuset-mems	Specifies the node where the container memory is allocated.
   --memory	Specifies the memory size allocated to the container.
   --net	Specifies the network mode used by the container. In this example, the host network mode is used.
   --name	Specifies the container name.
   arm/centos7/nginx:http Or arm/openeuler20/nginx:http	Specifies the image used by the container.

   

   You can use a script file to create containers in batches. The following is an example script that can create 24 containers in CentOS:

   #!/bin/bash
   # filename: ContainerCreate.sh
   beginCore=0;
   endCore=1;
   for i in  {1..6}
   do
           name=nginx_$i
           docker run -itd --privileged -v /home/share/:/home/share/ --cpuset-cpus $beginCore-$endCore --cpuset-mems 0 --memory 8589934592 --net=host --name $name arm/centos7/nginx:http  /bin/bash
           let "beginCore+=4"
           let "endCore+=4"
   done
   for i in {7..12}
   do
           name=nginx_$i
           docker run -itd --privileged -v /home/share/:/home/share/ --cpuset-cpus $beginCore-$endCore --cpuset-mems 1 --memory 8589934592 --net=host --name $name arm/centos7/nginx:http  /bin/bash
           let "beginCore+=4"
           let "endCore+=4"
   done
   for i in {13..18}
   do
           name=nginx_$i
           docker run -itd --privileged -v /home/share/:/home/share/ --cpuset-cpus $beginCore-$endCore --cpuset-mems 2 --memory 8589934592 --net=host --name $name arm/centos7/nginx:http  /bin/bash
           let "beginCore+=4"
   
           let "endCore+=4"
   done
   for i in {19..24}
   do
           name=nginx_$i
           docker run -itd --privileged -v /home/share/:/home/share/  --cpuset-cpus $beginCore-$endCore --cpuset-mems 3 --memory 8589934592 --net=host --name $name arm/centos7/nginx:http  /bin/bash
           let "beginCore+=4"
           let "endCore+=4"
   done

2. Check the started containers.

   1

   docker ps

   

   If no container is displayed after you run the docker ps command, run the following command to view the error information:

   1 2	docker ps -a docker logs nginx_1