linux docker--Swarm創建集羣

Swarm架構

**
Swarm作爲一個管理Docker集羣的工具，首先需要將其部署起來，可以單獨將Swarm部署於一個節點。另外，自然需要一個Docker集羣，集羣上每一個節點均安裝有Docker。
Swarm架構中最主要的處理部分自然是Swarm節點，Swarm管理的對象自然是Docker Cluster，Docker Cluster由多個Docker Node組成，而負責給Swarm發送請求的是Docker Client。

Swarm deamon只是一個調度器（Scheduler）加路由器(router)，Swarm自己不運行容器，它只是接受docker客戶端發送過來的請求，調度適合的節點來運行容器，這意味着，即使Swarm由於某些原因掛掉了，集羣中的節點也會照常運行，當Swarm重新恢復運行之後，它會收集重建集羣信息。

環境搭建

**
三臺主機
server0 172.25.254.56
server1 172.25.254.50
server2 172.25.254.1

安裝docker

vim  /etc/yum.repos.d/docker.repo 

[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/experimental/centos/7/
enabled=1
gpgcheck=0
gpgkey=https://yum.dockerproject.org/gpg
~                                                
yum -y install docker-engine

[root@foundation156 ~]# systemctl start docker
[root@foundation156 ~]# docker  images 
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
[root@foundation156 ~]# docker  --version
Docker version 1.12.6, build 78d1802, experimental


三臺主機安裝即可  
ps （根據前一部分的博客選擇rpm包安裝也可以）

swarm集羣搭建

node0作爲初始節點供其他節點加入
Connection to server1 closed.
[root@foundation156 Desktop]# docker swarm init  --advertise-addr 172.25.254.56
Swarm initialized: current node (59rkk6ozh5h1ddptl88f52h0v) is now a manager.

To add a worker to this swarm, run the following command:

    docker swarm join \
    --token SWMTKN-1-589zuow0efnzllasdj1nei7w34p02z6mkm443o3i5avuvn01tj-3ywyld3erpdnf7n4jhbgbzocs \
    172.25.254.56:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.


執行命令後提示其他節點使用系統提示命令加入節點即可

節點加入

[root@server2 docker]# docker swarm join     --token SWMTKN-1-589zuow0efnzllasdj1nei7w34p02z6mkm443o3i5avuvn01tj-3ywyld3erpdnf7n4jhbgbzocs     172.25.254.56:2377
This node joined a swarm as a worker.


在node查看端口使用情況

看到使用了2377端口  所以在需要打開防火牆時  需要打開對應的端口

[root@foundation156 Desktop]# netstat -anple  |grep  docker
tcp        0      0 172.25.254.56:56024     172.25.254.56:2377      ESTABLISHED 0          73800      3548/dockerd        
tcp        0      0 127.0.0.1:43323         127.0.0.1:2377          ESTABLISHED 0          72244      3548/dockerd        
tcp6       0      0 :::2377                 :::*                    LISTEN      0          70307      3548/dockerd        
tcp6       0      0 :::7946                 :::*                    LISTEN      0          70312      3548/dockerd        
tcp6       0      0 127.0.0.1:2377          127.0.0.1:43323         ESTABLISHED 0          70309      3548/dockerd        
tcp6       0      0 172.25.254.56:2377      172.25.254.56:56024     ESTABLISHED 0          72273      3548/dockerd        
tcp6       0      0 172.25.254.56:2377      172.25.254.50:45988     ESTABLISHED 0          73673      3548/dockerd        
tcp6       0      0 172.25.254.56:2377      172.25.254.1:51654      ESTABLISHED 0          73669      3548/dockerd        
udp6       0      0 :::7946                 :::*                                0          70313      3548/dockerd        


在node0查看是否成爲sarm集羣
docker  info

........
Swarm: active
 NodeID: 59rkk6ozh5h1ddptl88f52h0v
 Is Manager: true
 ClusterID: 8bq7ol10vkzyra3xhlfvuv0t3
 Managers: 1
 Nodes: 3
 Orchestration:
  Task History Retention Limit: 5
........

列出所有節點

[root@foundation156 Desktop]# docker node ls
ID                           HOSTNAME                       STATUS  AVAILABILITY  MANAGER STATUS
59rkk6ozh5h1ddptl88f52h0v *  foundation156.ilt.example.com  Ready   Active        Leader
6246ae4zn9asricvh2d3uc1qp    server1                        Ready   Active        
daugy9sjlh5zet6vnkh0fo1h3    server2                        Ready   Active        



在忘記添加節點命令時 通過以下命令查看

[root@foundation156 Desktop]# docker  swarm   join-token manager 
To add a manager to this swarm, run the following command:

    docker swarm join \
    --token SWMTKN-1-589zuow0efnzllasdj1nei7w34p02z6mkm443o3i5avuvn01tj-5taetju3kdmcvcunu3h7csm3l \
    172.25.254.56:2377

[root@foundation156 Desktop]# docker  swarm   join-token worker 
To add a worker to this swarm, run the following command:

    docker swarm join \
    --token SWMTKN-1-589zuow0efnzllasdj1nei7w34p02z6mkm443o3i5avuvn01tj-3ywyld3erpdnf7n4jhbgbzocs \
    172.25.254.56:2377


目前只有一個主導的節點server0  爲了集羣高可用並且避免單點故障
提升server1爲manager節點 使其也可以管理集羣

[root@foundation156 Desktop]# docker node promote server1
Node server1 promoted to a manager in the swarm.
[root@foundation156 Desktop]# docker node ls
ID                           HOSTNAME                       STATUS  AVAILABILITY  MANAGER STATUS
59rkk6ozh5h1ddptl88f52h0v *  foundation156.ilt.example.com  Ready   Active        Leader
6246ae4zn9asricvh2d3uc1qp    server1                        Ready   Active        Reachable
daugy9sjlh5zet6vnkh0fo1h3    server2                        Ready   Active

常用命令

docker swarm：集羣管理，子命令主要有下面幾個。

docker swarm init命令用於初始化一個集羣

docker swarm join命令用於加入一個現有集羣

docker swarm leave命令由於離開集羣

有些時候需要維護一個節點，此時此節點可能會網絡斷開或者需要關機，造成節點上服務不可用。使用 docker node update –availability drain 將節點下線，swarm 會將當前節點上的容器關閉並在其他節點上啓動。當維護完成，需要上線是，將節點狀態修改爲 active狀態即可,命令如下：docker node update –availability active

運行服務測試集羣性能

在物理機pull nginx鏡像  本紀可以使用 但是虛擬機上網下載太滿 所以將物理機鏡像保存爲tar文件scp讓虛擬機使用即可

[root@foundation156 Desktop]# docker save   -o nginx.tar  nginx
[root@foundation156 Desktop]# ll  nginx.tar
-rw------- 1 root root 112703488 Aug 20 20:18 nginx.tar

[root@foundation156 Desktop]# scp   nginx.tar  root@server1:/mnt/
nginx.tar                                     100%  107MB 107.5MB/s   00:01    
[root@foundation156 Desktop]# scp   nginx.tar  root@server2:/mnt/
nginx.tar                                     100%  107MB 107.5MB/s   00:01    
[root@foundation156 Desktop]# docker  service rm  nginx
nginx

虛擬機導入鏡像即可
[root@server2 docker]# vim  /etc/sysconfig/network-scripts/ifcfg-ens3 
[root@server2 docker]# cd /mnt/
[root@server2 mnt]# docker  load  -i nginx.tar 
cdb3f9544e4c: Loading layer 58.44 MB/58.44 MB
a8c4aeeaa045: Loading layer 54.24 MB/54.24 MB
08d25fa0442e: Loading layer 3.584 kB/3.584 kB
Loaded image: nginx:latest
[root@server2 mnt]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
nginx               latest              c82521676580        3 weeks ago         109 MB



[root@foundation156 Desktop]# docker  pull  nginx
Using default tag: latest
latest: Pulling from library/nginx
be8881be8156: Pull complete 
32d9726baeef: Pull complete 
87e5e6f71297: Pull complete 
Digest: sha256:d85914d547a6c92faa39ce7058bd7529baacab7e0cd4255442b04577c4d1f424
Status: Downloaded newer image for nginx:latest
[root@foundation156 Desktop]# docker images nginx 
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
nginx               latest              c82521676580        3 weeks ago         109 MB
[root@foundation156 Desktop]# docker service create --replicas 3 -p 80:80 --name nginx nginx:latest
244icxsoy3n8g5gh4otdio0pp
[root@foundation156 Desktop]# docker service   ls
ID            NAME   REPLICAS  IMAGE         COMMAND
244icxsoy3n8  nginx  1/3       nginx:latest  


查看物理機nginx服務詳細信息

[root@foundation156 Desktop]# docker  service  ps nginx
ID                         NAME     IMAGE         NODE     DESIRED STATE  CURRENT STATE            ERROR
cqawk4av2vj2579lsc7n8udse  nginx.1  nginx:latest  server0  Running        Running 3 seconds ago    
1rvhljwyvajyklqkbjgn7fbt8  nginx.2  nginx:latest  server2  Running        Preparing 8 seconds ago  
bhkx7if20gcwd8wrgkq7aqcqr  nginx.3  nginx:latest  server1  Running        Running 6 seconds ago    


查看節點的進程

[root@server1 mnt]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
7aade034cd8b        nginx:latest        "nginx -g 'daemon ..."   2 minutes ago       Up 2 minutes        80/tcp              nginx.2.bn25l3rukkufe34ry7kkzu06h

瀏覽器測試即可

使用 visualzer進行測試

安裝鏡像

[root@server1 ~]# docker run -it -d -p 8080:8080   -v /var/run/docker.sock:/var/run/docker.sock  dockersamples/visualizer
e6bc05f62386ea0c5730dbb6c5393224e81f61e831a2931c14cbff04d1c79011

瀏覽器測試即可

關閉server後
服務漂移至server3

[root@server3 ~]# docker  ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
6e599b133fd8        nginx:latest        "nginx -g 'daemon ..."   5 minutes ago       Up 4 minutes        80/tcp              nginx.1.8yy6rf4g565xqeb6q50y8hroa
e7ef3ec12304        nginx:latest        "nginx -g 'daemon ..."   33 minutes ago      Up 33 minutes       80/tcp              nginx.2.qq3si9jorvrml2dq5ftkvshny

再測試負載均衡
成功

[root@foundation15 docker]#  for i in {1..10};do  curl  172.25.15.20; done
server1
server3
server2
server1
server3
server2
server1
server3
server2
server1

批量化生成nginx

[root@server1 ~]# docker service scale  nginx=30

批量更新這一步再生產中作用較大
測試再nginx主機上更新2048鏡像

[root@server1 ~]# docker  service  update  --image  westos.org/game2048 --update-parallelism 3  --update-delay 10s  nginx
nginx

等待更新即可

看到30臺已經更新完成
[root@server1 ~]# docker service ls
ID            NAME   MODE        REPLICAS  IMAGE
1mj2yiaoo9ok  viz    replicated  1/1       dockersamples/visualizer:latest
p16i2s6m74zg  nginx  replicated  30/30     westos.org/game2048:latest

linux docker--Swarm創建集羣

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