Detailed explanation of docker-machine usage
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Docker-machine is a Docker management tool officially provided by Docker. This can be easily done with docker-machine: Install and run docker on Windows and MAC platforms Build and manage multiple Docker hosts Building a swarm cluster The environment is virtualbox installed under win, centos7 installed by virtualbox, network mode NAT+hostonly ip:192.168.56.102 (hostonly) 1. Install docker-machine: curl -L https://github.com/docker/machine/releases/download/v0.13.0/docker-machine-`uname -s`-`uname -m` >/tmp/docker-machine && chmod +x /tmp/docker-machine && sudo cp /tmp/docker-machine /usr/local/bin/docker-machine 2. Check the docker-machine version: # docker-machine version [root@docker ~]# docker-machine version docker-machine version 0.13.0, build 9ba6da9 3. Create a machine in centos7 environment: [root@localhost ~]# docker-machine create -d virtualbox default Creating CA: /root/.docker/machine/certs/ca.pem Creating client certificate: /root/.docker/machine/certs/cert.pem Running pre-create checks... Error with pre-create check: "VBoxManage not found. Make sure VirtualBox is installed and VBoxManage is in the path" But it reported an error, thinking that the centos7 environment installed by virtualbox supports the virtualbox driver, only to find that the environment installation supports the virtualbox driver To use the virtualbox driver, you need to install virtualbox, and the solution for Ubuntu is:
So we use the generic driver. For details, please refer to the official website: https://docs.docker.com/machine/drivers/generic/ [root@localhost ~]# docker-machine create -d generic --generic-ip-address=192.168.56.102 --generic-ssh-key ~/.ssh/id_rsa --
Still an error occurs. This is because ssh authentication is also required when docker-machine creates a machine for the local machine: [root@localhost ~]# ssh-keygen [root@localhost ~]# ssh-copy-id [email protected] Send the password to yourself, and then continue to create the machine: [root@localhost ~]# docker-machine create -d generic --generic-ip-address=192.168.56.102 --generic-ssh-key ~/.ssh/id_rsa --generic-ssh-user=root vm Running pre-create checks... Creating machine... (vm) Importing SSH key... Waiting for machine to be running, this may take a few minutes... Detecting operating system of created instance... Waiting for SSH to be available... Detecting the provisioner... Provisioning with centos... Copying certs to the local machine directory... Copying certs to the remote machine... Setting Docker configuration on the remote daemon... Checking connection to Docker... Docker is up and running! To see how to connect your Docker Client to the Docker Engine running on this virtual machine, run: docker-machine env vm So finally created the machine successfully Check out docker-machine: [root@localhost ~]# docker-machine ls NAME ACTIVE DRIVER STATE URL SWARM DOCKER ERRORS vm-generic Running tcp://192.168.56.102:2376 v17.09.0-ce View the environment variables of the VM: [root@localhost ~]# docker-machine env vm export DOCKER_TLS_VERIFY="1" export DOCKER_HOST="tcp://192.168.56.102:2376" export DOCKER_CERT_PATH="/root/.docker/machine/machines/vm" export DOCKER_MACHINE_NAME="vm" # Run this command to configure your shell: # eval $(docker-machine env vm) Load environment variables: [root@localhost ~]# eval $(docker-machine env vm) Use ssh to log in to the machine: [root@localhost ~]# docker-machine ssh --help Usage: docker-machine ssh [arg...] Log into or run a command on a machine with SSH. Description: Arguments are [machine-name] [command] [root@localhost ~]# docker-machine ssh vm Last login: Sat Nov 4 17:55:53 2017 from 192.168.56.102 [root@vm ~]# Now create a container in the local environment and start it: [root@localhost ~]# docker run -d --name=nginx nginx [root@localhost ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 6e62975fab90 nginx "nginx -g 'daemon ..." About a minute ago Up 59 seconds 80/tcp nginx Then ssh remotely to the docker-machine: [root@localhost ~]# docker-machine ssh vm Last login: Sat Nov 4 18:13:27 2017 from 192.168.56.102 [root@vm ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 6e62975fab90 nginx "nginx -g 'daemon ..." About a minute ago Up About a minute 80/tcp nginx You can see that the container ids in the docker host and the docker-machine host are the same Use docker-machine to install docker and create containers The above is to create a machine for yourself locally. Now create a docker-machine for the remote docker host: 1. First, authenticate the SSH connection between 192.168.101.14 and the host 192.168.56.102: [root@docker ~]# ssh-keygen [root@docker ~]# ssh-copy-id [email protected] 2. Create a machine: [root@docker ~]# docker-machine create -d generic --generic-ip-address=192.168.56.102 --generic-ssh-key ~/.ssh/id_rsa --generic-ssh-user=root default Creating CA: /root/.docker/machine/certs/ca.pem Creating client certificate: /root/.docker/machine/certs/cert.pem Running pre-create checks... Creating machine... (default) Importing SSH key... Waiting for machine to be running, this may take a few minutes... Detecting operating system of created instance... Waiting for SSH to be available... Detecting the provisioner... Provisioning with centos... Copying certs to the local machine directory... Copying certs to the remote machine... Setting Docker configuration on the remote daemon... Checking connection to Docker... Docker is up and running! To see how to connect your Docker Client to the Docker Engine running on this virtual machine, run: docker-machine env default Execute the environment variables and enter the machine environment: [root@docker ~]# docker-machine env default [root@docker ~]# eval $(docker-machine env default) 3. View the created machine: [root@docker ~]# docker-machine ls NAME ACTIVE DRIVER STATE URL SWARM DOCKER ERRORS default - generic Running tcp://192.168.56.102:2376 v17.09.0-ce You can see the machine created for the remote host 192.168.56.102 in the 192.168.101.14 environment 4. Create a container: [root@docker ~]# docker run -d --name=nginx nginx (no nginx image locally) b1f08986f6d5dbb1ede699e915bde734bab278fbe70f93af06ec2267fae2fef3 [root@docker ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES b1f08986f6d5 nginx "nginx -g 'daemon ..." 4 seconds ago Up 3 seconds 80/tcp nginx 5. SSH to the machine: [root@docker ~]# docker-machine ssh default Last login: Sat Nov 4 18:51:49 2017 from 192.168.56.1 [root@default ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES b1f08986f6d5 nginx "nginx -g 'daemon ..." 23 seconds ago Up 22 seconds 80/tcp nginx Now check if the container is created on the remote host: [root@localhost ~]# docker ps -a could not read CA certificate "/root/.docker/machine/machines/default/ca.pem": open /root/.docker/machine/machines/default/ca.pem: no such file or directory Cause of error: Since I just set up a machine for myself at 192.168.56.102, I kept the environment variables of the previous machine. Although I have deleted it now, I have set the environment variables. Cancel the environment variables I just set: [root@localhost ~]# unset DOCKER_TLS_VERIFY [root@localhost ~]# unset DOCKER_CERT_PATH [root@localhost ~]# unset DOCKER_MACHINE_NAME [root@localhost ~]# unset DOCKER_HOST Then re-view: [root@localhost ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES b1f08986f6d5 nginx "nginx -g 'daemon ..." 8 minutes ago Up 8 minutes 80/tcp nginx It can be found that the container is successfully created for the remote host Now the image centos_nginx:v4 exists on 192.168.101.14, but the remote host 192.168.56.102 does not have this image. Now create a container to see if the remote host can be created successfully? [root@docker ~]# docker pull registry.cn-hangzhou.aliyuncs.com/wadeson/jsonhc:v4 [root@docker ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE nginx latest b72d63324dbb 13 hours ago 108MB registry.cn-hangzhou.aliyuncs.com/wadeson/jsonhc v4 6c5128aaff05 2 days ago 464MB Then check on the remote host: [root@localhost ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE nginx latest b72d63324dbb 13 hours ago 108MB registry.cn-hangzhou.aliyuncs.com/wadeson/jsonhc v4 6c5128aaff05 2 days ago 464MB You can see that the images of the two hosts are synchronized, and the containers are also synchronized. Docker under vm can create containers for Docker under VirtualBox, and more locally, it can create containers for other environments such as the cloud, through docker-machine Before this, the images of 192.168.101.14 disappeared because of setting the machine environment variable: unset DOCKER_TLS_VERIFY unset DOCKER_CERT_PATH unset DOCKER_MACHINE_NAME unset DOCKER_HOST Execute the above to cancel the machine environment variable to return to the original environment: [root@docker ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE centos_init v1 383ff3502443 26 hours ago 448MB centos_nginx v8 6f792dc07c35 2 days ago 464MB centos_nginx v7 9e875385d6be 2 days ago 464MB centos_nginx v6 959fdf4d4288 2 days ago 464MB centos_nginx v5 5c1131306686 2 days ago 464MB registry.cn-hangzhou.aliyuncs.com/wadeson/jsonhc v4 6c5128aaff05 2 days ago 464MB 192.168.101.14:5000/centos_nginx v4 6c5128aaff05 2 days ago 464MB centos_nginx v4 6c5128aaff05 2 days ago 464MB centos_nginx v3 0e49a2c0562f 2 days ago 464MB centos_nginx v2 2031faf8894a 2 days ago 464MB centos_nginx v1 78d18f16e757 3 days ago 464MB registry latest 2ba7189700c8 9 days ago 33.3MB ubuntu latest 747cb2d60bbe 3 weeks ago 122MB centos latest 196e0ce0c9fb 7 weeks ago 197MB If you need to return to the machine environment, continue to execute the machine environment variable. This method isolates local and remote images and containers well. This is the end of this article about the detailed usage of docker-machine in docker. For more information about the usage of docker machine, please search for previous articles on 123WORDPRESS.COM or continue to browse the following related articles. I hope everyone will support 123WORDPRESS.COM in the future! You may also be interested in:
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