[root@ docker]# cat /etc/yum.repos.d/docker-main.repo
[docker-main-repo]
name=Docker main Repository
baseurl=https://get.daocloud.io/docker/yum-repo/main/CentOS/7
enabled=1
gpgcheck=1
gpgkey=https://get.daocloud.io/docker/yum/gpg
[root@ docker]# yum install docker-engine –y
[root@ docker]# docker –version
Docker version 17.05.0-ce, build 89658be
firewall-cmd –add-port=2377/tcp –permanent
firewall-cmd –add-port=7946/tcp –permanent
firewall-cmd –add-port=7946/udp –permanent
firewall-cmd –add-port=4789/udp –permanent
firewall-cmd –reload**
[root@ docker]# cat /etc/docker/daemon.json
{
“insecure-registries”:[“docker-registry.rmohan.com:5000”],
“log-driver”:”json-file”,
“log-opts”:{“max-size”:”1024m”,”max-file”:”2″}
}
[root@ ~]# systemctl restart docker.service
[root@master ~]# docker swarm join-token worker
To add a worker to this swarm, run the following command:
docker swarm join \
–token SWMTKN-1-4p4djbee1kqcss8x5prfzg6v01x0y7hfa7rqob6rffg6e2p2wq-278qafb9ptpqtfebr0kyngi0b \
192.168.191.6:2377
[root@filters ~]# docker node ls
ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS
0y4ga216x49nd9zt821afe45p * mohan_191_6 Ready Active Reachable
56mgklq3iyf0ajioytmtr0b44 mohan_191_10 Ready Active
b5mljua4e0tchrrk871ggbw7r mohan_191_7 Ready Active Reachable
gxm1gvh8lx2eja36a4cms9w98 mohan_182_212 Ready Active
hgweoxc5vmy9g30uyozmbumhj mohan_182_213 Ready Active
lluom23ugtfuiwphcye2frbmd mohan_182_215 Ready Active
om0ezdbqzdvavn8z8d844osbo mohan_182_214 Ready Active
t00tu1qs7wbll2fg2accsx7wf mohan_191_4 Ready Active Leader
tk89xphvsg16rz7b7l6lam4xv mohan_191_9 Ready Active
xbcx4hx2lq3ji8zog2ayzctat mohan_191_8 Ready Active Reachable
y3pnrw9jt69vkfiuxrs0co7ke mohan_191_5 Ready Active Reachable
docker swarm join –token manger node ip:port
[root@dockernode~]#docker swarm join –token SWMTKN-1-4p4djbee1kqcss8x5prfzg6v01x0y7hfa7rqob6rffg6e2p2wq-278qafb9ptpqtfebr0kyngi0b 192.168.191.6:2377
$ docker run Ubuntu:14.04 /bin/echo ‘Hello world’
Hello world
$ docker run -t -i ubuntu:14.04 /bin/bash
root@af8bae53bdd3:/#
$ docker run -d ubuntu /bin/sh -c “while true; do echo hello world; sleep 1; done”
cb30b87566d0550ec5f1232d148c5ffed6546c347889e58a6405579f2af73f2a
$ docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
cb30b87566d0 ubuntu “/bin/sh -c ‘while t…” 2 minutes ago Up 2 minutes goofy_mcclintock
$ docker container logs goofy_mcclintock
hello world
hello world
hello world
$ docker container stop goofy_mcclintock
goofy_mcclintock
$ docker container ls -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
cb30b87566d0 ubuntu “/bin/sh -c ‘while t…” 20 minutes ago Exited (137) 23 seconds ago goofy_mcclintock
$ docker attach e1ff
root@e1ffd4f792fe:/#
Note: If exit from this stdin, it will cause the container to stop.
The exec command
-i -t parameter
docker exec can be followed by multiple parameters, here mainly the -i -t parameter.
When only the -i parameter, since there is no allocation of pseudo-terminals, the interface is not familiar Linux command prompt, the command execution
line results can still be returned.
When the -i -t parameter is used together, you can see the familiar Linux command prompt.
$ docker run -dit ubuntu
16168d4b66b115b5afac5836db3ff93304774e98489f628ac625fff2bcd640ba
$ docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
16168d4b66b1 ubuntu “/bin/bash” 58 seconds ago Up 57 seconds happy_bardeen
$ docker exec -it 16168 bash
root@16168d4b66b1:/#
Exit from this stdin will not cause the container to stop. That’s why the docker exec is recommended.
For more parameter descriptions, please use docker exec –help to view.
Fifth, delete the container
Delete a container that is in a terminated state in the format:
docker container rm [options] CONTAINER [CONTAINER…]
$ docker container rm awesome_payne
awesome_payne
If you want to delete a running container, you can add the -f parameter. Docker will send a SIGKILL signal to the container.
Clean up all containers in the terminated state. Use the docker container ls -a command to view all the containers that have been created, including the termination status. If the number is too large, it may be cumbersome to delete them one by one. You can use the following command to clear all the termination status. Container.
$ docker container prune
WARNING! This will remove all stopped containers.
Are you sure you want to continue? [y/N] y
Deleted Containers:
545f8f6d19286efae28307d06ed1acc034d07f109e907c01892471a6f89e772d
cb30b87566d0550ec5f1232d148c5ffed6546c347889e58a6405579f2af73f2a
……
Export and import containers
Exporting a container
If you want to export a local container, you can use the docker export command.
$ docker container ls -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
16168d4b66b1 ubuntu “/bin/bash” 18 minutes ago Up 18 minutes happy_bardeen
$ docker export 16168d4b66b1 > ubuntu.tar
This will export the container snapshot to a local file.
Import container snapshots
can be imported as mirrors from the container snapshot file using docker import, for example
$ cat ubuntu.tar | docker import – test/ubuntu:v1.0
sha256:91b174fec9ed55d7ebc3d2556499713705f40713458e8594efa114f261d7369a
$ docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
test/ubuntu v1.0 91b174fec9ed 10 seconds ago 69.8MB
ubuntu latest 735f80812f90 3 weeks ago 83.5MB
Alternatively, you can import it by specifying a URL or a directory, such as
$ docker import http://example.com/exampleimage.tgz example/imagerepo
Note: Users can either use the docker load to import the image storage file to the local image library, or use docker import to import a container snapshot to the local image library. The difference between the two is that the container snapshot file will discard all history and metadata information (that is, only the snapshot state of the container at the time), and the image storage file will save the full record and be large. In addition, metadata information such as tags can be reassigned when importing from a container snapshot file.
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