[TIL][Docker] Docker SwarmKit 學習紀錄
前言
其實之前就跑過一次，不過沒有記錄下來詳細的指令．這次為了比較 Docker Swarm ， Docker Swarm Kit 還有 Docker Swarm Mode，又把整個流程跑了一次．
稍微做個紀錄．
SwarmKit 使用流程
安裝 SwarmKit
由於 Open Source Project，需要另外安裝．
go get -u github.com/docker/swarmkit
cd $GOPATH/src/github.com/docker/swarmkit
make binaries
mv bin/* $GOBIN
注意: 如果你不是使用 Brew 安裝 Golang 你可能不會有 $GOBIN 參數，可以改到 $GOPATH/bin
建立 Cluster Master Node
swarmd -d /tmp/node-1 --listen-control-api /tmp/manager1/swarm.sock --hostname node-1
要注意解釋一下，其中 /tmp/manager1/swarm.sock 是 SwarmKit socket 的位址．如果其他的 node 要加入，一定要將環境變數加入．
export SWARM_SOCKET=/tmp/manager1/swarm.sock
然後我們來查詢，現在 Master 的 token （在新的 console)
export SWARM_SOCKET=/tmp/manager1/swarm.sock
swarmctl cluster inspect default
>ID : 1piq7f9tr1xlmnui4xhjhsafi
>Name : default
>Orchestration settings:
> Task history entries: 5
>Dispatcher settings:
> Dispatcher heartbeat period: 5s
>Certificate Authority settings:
> Certificate Validity Duration: 2160h0m0s
> Join Tokens:
> Worker: >SWMTKN-1-1wttj6u10f9fueptptma9ohf99zcxt0gia1wt3a5odphi6nt1f-c4y428p7wwr23efwo4xw6qiwz
> Manager: >SWMTKN-1-1wttj6u10f9fueptptma9ohf99zcxt0gia1wt3a5odphi6nt1f-cdh5ucqp1xjvh3pp1rvs0two4
建立 Cluster Worker Node
節點 2 (Node2)
swarmd -d /tmp/node-2 --hostname node-2 --join-addr 127.0.0.1:4242 --join-token SWMTKN-1-1wttj6u10f9fueptptma9ohf99zcxt0gia1wt3a5odphi6nt1f-c4y428p7wwr23efwo4xw6qiwz
其中注意， --join-token 一定要加入，不然會找不到．請使用查詢到的，勿用到我提供的 :p
節點 3 (Node3)
swarmd -d /tmp/node-3 --hostname node-3 --join-addr 127.0.0.1:4242 --join-token SWMTKN-1-1wttj6u10f9fueptptma9ohf99zcxt0gia1wt3a5odphi6nt1f-c4y428p7wwr23efwo4xw6qiwz
確認節點都有建立成功
export SWARM_SOCKET=/tmp/manager1/swarm.sock swarmctl node ls
二 8/ 9 03:02:10 2016
ID Name Membership Status Availability Manager Status
-- ---- ---------- ------ ------------ --------------
01kgkezj7wcwij5qcp78raz1i node-1 ACCEPTED READY ACTIVE REACHABLE *
2ocq4129a4y2nq23hajdsqv0t node-3 ACCEPTED READY ACTIVE
b75cdesh7to4lb35wg17ul12x node-2 ACCEPTED READY ACTIVE
建立一個 Service Redis 3.0.5
swarmctl service create --name redis --image redis:3.0.5
確認 Service 有成功
swarmctl service ls
ID Name Image Replicas
-- ---- ----- --------
94h7xat76kjd50as63f5qtsex redis redis:3.0.5 1/1
觀察 Service 細節
swarmctl service inspect redis
ID : 94h7xat76kjd50as63f5qtsex
Name : redis
Replicas : 1/1
Template
Container
Image : redis:3.0.5
Task ID Service Slot Image Desired State Last State Node
------- ------- ---- ----- ------------- ---------- ----
49d41k08a4bifkeo67xv00f5c redis 1 redis:3.0.5 RUNNING RUNNING 1 minute ago node-1
Scale Service using SwarmKit
swarmctl service update redis --replicas 6
swarmctl service ls
ID Name Image Replicas
-- ---- ----- --------
94h7xat76kjd50as63f5qtsex redis redis:3.0.5 1/6
swarmctl service ls
ID Name Image Replicas
-- ---- ----- --------
94h7xat76kjd50as63f5qtsex redis redis:3.0.5 6/6
檢查更多詳細的參數
swarmctl service inspect redis 二 8/ 9 10:02:45 2016
ID : 94h7xat76kjd50as63f5qtsex
Name : redis
Replicas : 6/6
Template
Container
Image : redis:3.0.5
Task ID Service Slot Image Desired State Last State Node
------- ------- ---- ----- ------------- ---------- ----
49d41k08a4bifkeo67xv00f5c redis 1 redis:3.0.5 RUNNING RUNNING 2 minutes ago node-1
83av0fuyn7wqqk32fvpmrtu2o redis 2 redis:3.0.5 RUNNING RUNNING 27 seconds ago node-3
9lvd4xtwxlbskktxa7asa04fe redis 3 redis:3.0.5 RUNNING RUNNING 28 seconds ago node-2
74ca5vzx1wbviycrmuq8tb1mi redis 4 redis:3.0.5 RUNNING RUNNING 27 seconds ago node-2
6rwgiz70onihivlex5jdi96fj redis 5 redis:3.0.5 RUNNING RUNNING 27 seconds ago node-1
brp9u9fkk26xs6cmrseye4hcu redis 6 redis:3.0.5 RUNNING RUNNING 27 seconds ago node-3
更新服務到 3.0.6
預設並沒有使用 Rolling Update ，會直接更新到最新版本．
swarmctl service update redis --image redis:3.0.6
94h7xat76kjd50as63f5qtsex
swarmctl service inspect redis
ID : 89831rq7oplzp6oqcqoswquf2
Name : redis
Replicas : 6
Template
Container
Image : redis:3.0.6
Task ID Service Instance Image Desired State Last State Node
------- ------- -------- ----- ------------- ---------- ----
7947mlunwz2dmlet3c7h84ln3 redis 1 redis:3.0.6 RUNNING RUNNING 34 seconds ago node-3
56rcujrassh7tlljp3k76etyw redis 2 redis:3.0.6 RUNNING RUNNING 34 seconds ago node-1
8l7bwrduq80pkq9tu4bsd95p4 redis 3 redis:3.0.6 RUNNING RUNNING 36 seconds ago node-2
3xb1jxytdo07mqccadt06rgi0 redis 4 redis:3.0.6 RUNNING RUNNING 34 seconds ago node-1
16aate5akcimsye9cp5xis1ih redis 5 redis:3.0.6 RUNNING RUNNING 34 seconds ago node-2
dws408a3gz0zx0bygq3aj0ztk redis 6 redis:3.0.6 RUNNING RUNNING 34 seconds ago node-3
如果要使用 Rolling Update ，每隔 10 秒更新 2 台機器
swarmctl service update redis --image redis:3.0.7 --update-parallelism 2 --update-delay 10s
swarmctl service inspect redis 二 8/ 9 10:14:40 2016
ID : 94h7xat76kjd50as63f5qtsex
Name : redis
Replicas : 4/6
Update Status
State : UPDATING
Started : 14 seconds ago
Message : update in progress
Template
Container
Image : redis:3.0.7
Task ID Service Slot Image Desired State Last State Node
------- ------- ---- ----- ------------- ---------- ----
3lbgomkdkfszohl0jkhy7bgwp redis 1 redis:3.0.7 RUNNING PREPARING 13 seconds ago node-2
6db9gj8ssnfxhydtk00fgn93x redis 2 redis:3.0.6 RUNNING RUNNING 10 minutes ago node-2
dgq6iwt0eh951gpe7bd7kxmcf redis 3 redis:3.0.6 RUNNING RUNNING 10 minutes ago node-2
4rhy2jd7ecu968e0p51wohdn5 redis 4 redis:3.0.6 RUNNING RUNNING 10 minutes ago node-1
61sb7zev74d9jzh5vvud1vy4z redis 5 redis:3.0.6 RUNNING RUNNING 10 minutes ago node-1
bdy30kw7zq8mytmo6yzdqjm5d redis 6 redis:3.0.7 RUNNING PREPARING 13 seconds ago node-3
