[cloud native • Devops] master the container management tool rancher

Learning objectives in this chapter ：

• Master container management tools Rancher Installation and use of ;
• Mastery is based on Rancher Application deployment 、 Expansion and contraction operation .

Catalog

One 、 Container management tools Rancher Introduce

Two 、Rancher Installation

3、 ... and 、Rancher The initialization

1. Add environment

2. Add host

3. Add application

Four 、 Application deployment

1. Mysql Deploy

2. RabbitMQ Deploy

3. Redis Deploy

Four 、 Expand and shrink

1. Capacity expansion

2. Shrinkage capacity

5、 ... and 、 Load Balancer

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One 、 Container management tools Rancher Introduce

Rancher Is an open source enterprise level full stack container deployment and management platform , It's really just a Docker Graphical management interface of . It provides infrastructure services for containers , It can make CNI Compatible network services 、 Storage service 、 The host management 、 Load balancing 、 Firewall and other services span the public cloud 、 Private cloud 、 virtual machine 、 Physical machine environment operation , Truly realize one click application deployment and management . In addition, it also provides services such as load balancing 、 Advanced functions such as elastic expansion , It is also a commonly used operation and maintenance tool .

Tips ： because Rancher yes Docker Interface operation , For example, application deployment and other operations are actually repeated , To avoid port conflicts , Therefore, it is recommended to operate in a new system image .

Two 、Rancher Installation

First step ： download Rancher Mirror image ;

docker pull rancher/server

The second step ： establish Rancher Containers ;

docker run -di --name=rancher -p 9090:8080 rancher/server

The third step ： Local browser input virtual machine / The server IP: Port number   Visit , See the following interface Rancher Installation successful ;

If you can't access it, check whether the container you created has been started .

The initial interface is English , You can switch Chinese in the lower right corner ;

3、 ... and 、Rancher The initialization

1. Add environment

Rancher Support grouping resources into multiple environments , Each environment has its own independent infrastructure resources and services , And by one or more users 、 The team / Organizational management . for instance ： You can create independent development 、 Test and production environment and ensure safe isolation between these environments , Grant access to the development environment to all personnel , The test environment allows only a small team to access .

Click on “Default” --> “ Environmental management ”, Enter the environment interface ;

Click on “ Add environment ”, Enter the environment name and description to create ;

The following is the development I created 、 production 、 Test environment , Each environment is completely separate , The configuration of the environment will not affect each other ;

Choose “Default” You can switch between environments ;

2. Add host

choice “ Infrastructure ” --> “ host ”, Click Add host ;

The default choice is our virtual machine / The site address of the server , Click save ;

Then you will enter the following interface ;

Notice the code in step 5 , This code means to create a Rancher Proxy container , When you need to add Rancher Virtual machines for services / Run this command on the server , Then the virtual machine / The server will communicate with Rancher Services build connections .

Copy the code , When you need to connect Rancher Virtual machines for services / Running on the server , The successful operation is as follows ;

At this time in Rancher The host interface of will add a host ;

3. Add application

The application here actually refers to one of our projects , And there are many services under a certain project , In other words, an application is actually a grouping of services ;

Click on “ application ” --> “ All / user ”, And then click “ Add application ” Button ;

Enter the name and description and click “ establish ”;

The success is as follows ;

After the application is created successfully , You can deploy services on the application , That is, application deployment .

Four 、 Application deployment

Actually in Rancher Central deployment application and traditional methods （ Command line operations ） The biggest difference is that all operations here are carried out in the graphical interface , More intuitive , Please see the following deployment demonstration .

1. Mysql Deploy

Download Image first centos/mysql-57-centos7 Add database services ;

[[email protected] ~]# docker pull centos/mysql-57-centos7
Using default tag: latest
latest: Pulling from centos/mysql-57-centos7
d8d02d457314: Pull complete 
a11069b6e245: Pull complete 
596303fb1aa3: Pull complete 
a29499e779a7: Pull complete 
17d1a52c2e00: Pull complete 
ed24591227fe: Pull complete 
de0ad46e3ed9: Pull complete 
c62e4a984a9c: Pull complete 
01d54c6bda68: Pull complete 
Digest: sha256:e08ee4d43b7356607685b69bde6335e27cf20c020f345b6c6c59400183882764
Status: Downloaded newer image for centos/mysql-57-centos7:latest
docker.io/centos/mysql-57-centos7:latest
[[email protected] ~]# 

Then in the application we created , Click on “ Add service ”;

At this point, it can be deployed in the form of a graphical interface MySQL Yes , Make relevant settings ;

Click on “ establish ”, Show “Active” The deployment is successful ;

2. RabbitMQ Deploy

Download mirroring rabbitmq:management;

[[email protected] ~]# docker pull rabbitmq:management
management: Pulling from library/rabbitmq
7b1a6ab2e44d: Pull complete 
37f453d83d8f: Pull complete 
e64e769bc4fd: Pull complete 
c288a913222f: Pull complete 
12addf9c8bf9: Pull complete 
eaeb088e057d: Pull complete 
b63d48599313: Pull complete 
05c99d3d2a57: Pull complete 
43665bfbc3f9: Pull complete 
f14c7d7911b1: Pull complete 
Digest: sha256:4c4b66ad5ec40b2c27943b9804d307bf31c17c8537cd0cd107236200a9cd2814
Status: Downloaded newer image for rabbitmq:management
docker.io/library/rabbitmq:management
[[email protected] ~]# 

Add service , Set relevant properties and port mapping （ Include port 5671 5672 4369 15671 15672 25672）;

The successful deployment is as follows ;

Access in browser virtual machine / The server IP:15672;

RabbitMQ Installation successful .

3. Redis Deploy

Download mirroring redis;

[[email protected] ~]# docker pull redis
Using default tag: latest
latest: Pulling from library/redis
a2abf6c4d29d: Pull complete 
c7a4e4382001: Pull complete 
4044b9ba67c9: Pull complete 
c8388a79482f: Pull complete 
413c8bb60be2: Pull complete 
1abfd3011519: Pull complete 
Digest: sha256:db485f2e245b5b3329fdc7eff4eb00f913e09d8feb9ca720788059fdc2ed8339
Status: Downloaded newer image for redis:latest
docker.io/library/redis:latest
[[email protected] ~]# 

Add service , Set relevant properties and port mapping （ port 6379）;

The successful creation is as follows ;

Open the local Redis terminal , Input redis-cli -h virtual machine / The server IP Connect , The following can operate normally ,redis Deployment success ;

Four 、 Expand and shrink

Capacity expansion is to expand the number of containers , Shrink volume vice versa . In the actual operation and maintenance process , The container needs to provide a back-end support for the website , When the website access is high, more containers are needed to form the container's Micro service cluster , To reduce the bearing pressure . If the traffic is not so high , You can shrink the volume and release more space .

1. Capacity expansion

Select application , Add a new service base-service, But do not set port mapping , After creation, it defaults to a container ;

Click here “API” --> “WebHooks”;

Enter the add receiver interface , Select Add receiver , as follows ;

After selecting parameters , Click Create , At this point, a receiver is created for the service （ Expansion and contraction Services ）;

In fact, the receiver is configured with URL, This URL It mainly uses post Way to trigger , It's an interface , So that a certain software can call through this address Rancher,Rancher Trigger after receiving , Then carry out the corresponding expansion and contraction operation .

Return to the service page , You can see that the number of containers for the service is 1;

Copy receiver trigger address （ Interface ）, Use the local interface test tool to call the address （ I'm using ApiPost） Click Send ;

At this point, the number of containers for the service will automatically increase .

2. Shrinkage capacity

The operation of capacity reduction is the same as that of capacity expansion , No more details here .

5、 ... and 、 Load Balancer

When using expansion and reduction services , We do not set port mapping , Then there is no way to access the service directly , To solve this problem ,Rancher Provides a load balancer . When you want to access a service without port mapping , You need to add load balancing to this service .

Click on “ Add service ” --> “ Add load balancing ”;

Input port and target information , Create ; At this point, we can access our services through the special services of the load balancer .