為我的Web應用程序創(chuàng)建Docker鏡像
這里是我用來構(gòu)建Docker鏡像的Dockerfile：
FROM?golang
WORKDIR?/
RUN git clone https://djannot:xxxx@github.com/djannot/s3pics.gitWORKDIR/s3pics
RUN?go?build
EXPOSE 8080
構(gòu)建鏡像時我使用了--no-cache參數(shù)，以確保最新的源代碼是從GitHub上克隆的。
core@coreos1 /media/share1/Dockerfiles/s3pics?$?docker?build--no-cache.
Sending build?context?to Docker daemon 2.048kB?
Sending build?context?to Docker daemon?
Step0:FROM?golang
--->1ea210e0e1f6
Step1:WORKDIR /
--->Running ?in ?f6987b175723
--->022aa96f56d0
Removing intermediate?container?f6987b175723
Step2:RUN git clone https://djannot:xxxx@github.com/djannot/s3pics.git
--->Running in 54d6a32e90ba
Cloninginto's3pics'...
--->3369bca87577
Removing intermediate?container 54d6a32e90ba
Step3:WORKDIR /s3pics
--->Running in d875bc08eac9
--->73946142ea54
Removing intermediate?container?d875bc08eac9
Step4:RUN?go?build
--->Running in e0bd59c1f28b
--->baebdd1b633e?
Removing?intermediate?container?e0bd59c1f28b
Step5:EXPOSE 8080
--->Running in 16d3fa9be1c5
--->815b7aed2c83
Removing intermediate?container 16d3fa9be1c5
Successfully built 815b7aed2c83
最后，我推送鏡像到Docker registry。
core@coreos1/media/share1/Dockerfiles/s3pics?$?docker?push 10.64.231.45:5000/s3pics:2.0
The push?refers?to?a?repository [10.64.231.45:5000/s3pics] (len:1)
Sending image list
Pushing repository 10.64.231.45:5000/s3pics (1tags)?
Image 511136ea3c5aal ready?pushed,skipping
Image 16386e29a1f4already?pushed,skipping
Image 835c4d274060 already?pushed,skipping
Image 22c23ce0a90c already?pushed,skipping
Image 3f1e6432f26e already?pushed,skipping
Image 7982826b1e59 already?pushed,skipping
Image 1dafbd563f5a already?pushed,skipping
Image 7a94d87545e8 already?pushed,skipping
Image e2d60f7b3d07?already?pushed,skipping
Image 4f23222e2f74 already?pushed,skipping
Image 258b590ccdee already?pushed,skipping
Image 986643313a7b already?pushed,skipping
Image 1ea210e0e1f6 already?pushed,skipping
022aa96f56d0: Image successfully?pushed
3369bca87577:Image successfully?pushed
73946142ea54:Image successfully?pushed
baebdd1b633e:Image successfully?pushed
815b7aed2c83:Image successfully?pushed
Pushing tag forrev[815b7aed2c83] on {http://10.64.231.45:5000/v1/repositories/s3pics/tags/2.0}
我已經(jīng)指定了一個tag（2.0），以確保集群中的每個節(jié)點都會從Docker Registry獲取最新版本。
部署Mesos應用程序
現(xiàn)在，讓我們使用Docker鏡像部署一個Mesos應用：
POST http://<Mesos Marathon IP>:8080/v2/apps
{"id":"s3pics",
"cmd":"cd?/s3pics;?./s3pics?-AccessKey=denis@ad.forest?-SecretKey=xxxx?-EndPoint=http://denisnamespace.ns.viprds.ad.forest?-Namespace=denisnamespace",
"cpus":0.1,
"mem":64.0,
"instances":1,
"container":{
? ? ?"type":"DOCKER",
? ? ?"docker":{
? ? ? ? ? ?"image":"10.64.231.45:5000/s3pics:2.0",
? ? ? ? ? ?"network":"BRIDGE",
? ? ? ? ? ? "portMappings":[{"containerPort":8080,"hostPort":0,"protocol":"tcp"}]
}
},
"healthChecks":[{
"protocol":"HTTP",
"portIndex":0,
"path":"/",
"gracePeriodSeconds":10,
"intervalSeconds":20,
"maxConsecutiveFailures":3}]
}
當Mesos應用程序啟動后，Mesos Marathon UI就會顯示應用程序的狀態(tài)。
幾秒鐘之后，應用部署成功，Docker主機和端口顯示在UI中。
