Shulou(Shulou.com)06/02 Report--

Manage Docker Swarm clusters

1. Node state change management

[root@manager] # docker node update-- availability drain manager

Manager

[root@manager ~] # docker node ls

ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION

3ugwexq8el6e9ouj1iyguxtnq * manager Ready Drain Reachable 19.03.1

6p4qed1dyurk81nuxs2b3s72p worker01 Ready Active Leader 19.03.1

Zegtd8sspiw0lsctzc98cc0g4 worker02 Ready Active Reachable 19.03.1

At this time, manager can only manage nodes and cannot assign tasks.

2. Add tag metadata

[root@manager] # docker node update-- label-add GM-IDC-01 worker01

[root@manager ~] # docker node inspect worker01

"CreatedAt": "2019-08-22T07:09:10.403549405Z"

"UpdatedAt": "2019-08-22T08:16:14.952425008Z"

"Spec": {

"Labels": {

"GM-IDC-01":

... .. Omitted part

3. The lifting / lowering right of the node

For example: upgrade worker01,worker02 to management node

[root@manager ~] # docker node promote worker01 worker02

Node 6p4qed1dyurk81nuxs2b3s72p is already a manager.

Node zegtd8sspiw0lsctzc98cc0g4 is already a manager.

For example: reduce the weight of worker01,worker02 to a normal node

[root@manager ~] # docker node demote worker01 worker02

Manager worker01 demoted in the swarm.

Manager worker02 demoted in the swarm.

4. Exit the cluster

Management node exit

[root@manager ~] # docker swarm leave-force

Normal node exit

[root@worker01 ~] # docker swarm leave

Docker Swarm service management

Example: create a service named web from the Docker mirror httpd, with a specified copy of 2. 0.

[root@manager ~] # docker pull httpd # # download image

Note: the httpd service should comment out 'ServerName''

[root@manager] # docker service create-- replicas 2-- name web httpd

Overall progress: 2 out of 2 tasks

1/2: running

2/2: running

Verify: Service converged

[root@manager ~] # docker service ls

ID NAME MODE REPLICAS IMAGE PORTS

Edfomyazxto9 web replicated 2/2 httpd:latest

Show details of the service (omitted)

[root@manager ~] # docker service inspect web

[

{

"ID": "edfomyazxto9f7t7kbau2h453"

"Version": {

"Index": 1524

}

"CreatedAt": "2019-08-22T09:38:04.259651137Z"

"UpdatedAt": "2019-08-22T09:38:04.259651137Z"

"Spec": {

"Name": "web"

"Labels": {}

"TaskTemplate": {

"ContainerSpec": {

"Image": "httpd:latest@sha256:98caed3e3a90ed9db8d25dcbb98eebe0ce56358a9dbbc940d7eb66a8e2b88252"

...

Delete a service

[root@manager ~] # docker service rm web

two。 Rejoin the cluster and deploy web for nginx

Special note: each node must have an image of nginx before it can be deployed.

9 docker load-- input mynginx # # load the image and do it on each station

10 docker images

11 docker tag 848ea241199d nginx

12 docker images

13 clear

14 docker service create-- replicas 2-- name web nginx # # specify a copy of 2

15 docker service logs-f web

16 docker service ls

17 docker service ps web

[root@manager ~] # docker service ps web

ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS

Pb3hw77bm022 web.1 nginx:latest manager Running Running 12 minutes ago

9f6u648z18gk web.2 nginx:latest worker01 Running Running 12 minutes ago

18 docker service inspect web

19 docker service inspect-pretty web # # View information

... .

ContainerSpec:

Image: nginx:latest

Init: false

Resources:

Endpoint Mode: vip

Expansion / reduction of services

20 docker service scale web=3 # # Service expansion

21 docker service ps web

[root@manager ~] # docker service ps web

ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS

Pb3hw77bm022 web.1 nginx:latest manager Running Running 15 minutes ago

9f6u648z18gk web.2 nginx:latest worker01 Running Running 15 minutes ago

An6nc2lyhet5 web.3 nginx:latest worker02 Running Running 10 minutes ago

Reduction of service capacity

[root@manager ~] # docker service scale web=1

[root@manager ~] # docker service ps web

ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS

Pb3hw77bm022 web.1 nginx:latest manager Running Running 17 minutes ago

Add Overlay Network

In the Swarm cluster. When you add an Overlay network, you can connect one or more services. Then all containers in the network can communicate with each other!

1. Manage Node creation

[root@manager] # docker network create-- driver overlay my-network

0c5k9xirc0pp1a9qqgoksvyf5

two。 Create a service using the my-network network

[root@manager] # docker service create-- replicas 3-- network my-network-- name myweb nginx

Mm3gtfocd8dm63a2d3b4uivjq

Overall progress: 3 out of 3 tasks

1/3: running

2/3: running

3/3: running

Verify: Service converged

Creation and Application of data Volume

Create a data volume

[root@manager _ data] # docker volume create product-kgc

Product-kgc

View the created data volume

[root@manager _ data] # docker volume ls

DRIVER VOLUME NAME

Local product-kgc

Create a directory on this machine

[root@manager _ data] # mkdir-p / usr/share/nginx/html

Create a container

[root@manager _ data] # docker service create-- mount type=volume,src=product-kgc,dst=/usr/share/nginx/html-- replicas 1-- name kgc-web-01 nginx # # Image

View the created container

ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS

Bbqd215gwlog kgc-web-01.1 nginx:latest manager Running Running 11 minutes ago

View the details of the data volume

[root@manager ~] # docker volume inspect product-kgc

[

{

"CreatedAt": "2019-08-25T09:25:30+08:00"

"Driver": "local"

"Labels": {}

"Mountpoint": "/ var/lib/docker/volumes/product-kgc/_data"

"Name": "product-kgc"

"Options": {}

"Scope": "local"

}

]

Check whether the data is synchronized

[root@manager ~] # cd / var/lib/docker/volumes/product-kgc/_data/

[root@manager ~] # mkdir test01 test02

[root@manager ~] # docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

32f426b2a047 nginx:latest "/ run.sh" 16 minutes ago Up 16 minutes 80/tcp, 443/tcp kgc-web-01.1.bbqd215gwlog1v4a5j2ck2nvq

Enter the container and view # # the directory created under the local directory, which also exists in the container

[root@manager _ data] # docker exec-it 32f426b2a047 bash

[root@32f426b2a047 nginx] # ls / usr/share/nginx/html/

Test01 test02

Additional:: the second way to create a data volume, you can use the bind type

[root@manager] # docker service create-- replicas 3-- mount type=bind,src=/var/vhost/www/aa,dst=/usr/share/nginx/html-- name kgc-web-02 nginx

D6c5iw9gxo980embkb7aas1ky

Overall progress: 3 out of 3 tasks

1/3: running

2/3: running

3/3: running

Verify: Service converged

[root@manager ~] # touch / var/vhost/www/aa/abcd

[root@manager] # docker ps-a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

807ff87f1b2b nginx:latest "/ run.sh" 40 minutes ago Up 40 minutes 80/tcp, 443/tcp kgc-web-02.2.pkwe5ql9oaf7994iv5qt44cke

32f426b2a047 nginx:latest "/ run.sh" About an hour ago Up About an hour 80/tcp, 443/tcp kgc-web-01.1.bbqd215gwlog1v4a5j2ck2nvq

4f71487e7989 nginx:latest "/ run.sh" About an hour ago Created myweb.2.j771vgcjzw0t3cne3fauz3ydf

D4c2cf0b0953 nginx:latest "/ run.sh" About an hour ago Created myweb.1.hayst7oh5ck442xl9g51e54xl

[root@manager ~] # docker exec-it 807ff87f1b2b bash

[root@807ff87f1b2b nginx] # ls / usr/share/nginx/html/

Abcd

Verified successfully!

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