Docker批量容器编排的实现
简介
Dockerfilebuildrun是手动操作单个容器，假如使用微服务架构，需要启动100+个容器，他们之间的依赖关系如何维护？
DockerCompose用来轻松高效地管理容器，定义运行多个容器。
三个步骤：
- Dockerfile
- Services&docker-compose.yml
- docker-composeup
初体验
1.Dockerfile
FROMpython:3.7-alpine WORKDIR/code ENVFLASK_APPapp.py ENVFLASK_RUN_HOST0.0.0.0 RUNapkadd--no-cachegccmusl-devlinux-headers COPYrequirements.txtrequirements.txt RUNpipinstall-rrequirements.txt COPY.. CMD["flask","run"]
2.Service
importtime
importredis
fromflaskimportFlask
app=Flask(__name__)
cache=redis.Redis(host='redis',port=6379)
defget_hit_count():
retries=5
whileTrue:
try:
returncache.incr('hits')
exceptredis.exceptions.ConnectionErrorasexc:
ifretries==0:
raiseexc
retries-=1
time.sleep(0.5)
@app.route('/')
defhello():
count=get_hit_count()
return'HelloWorld!Ihavebeenseen{}times.\n'.format(count)
docker-compose.yml
version:'3'
services:
web:
build:.
ports:
-"5000:5000"
volumes:
-.:/code
-logvolume01:/var/log
links:
-redis
redis:
image:redis
volumes:
logvolume01:{}
docker-composeup
Startingcompose-demo_web_1...done
Startingcompose-demo_redis_1...done
Attachingtocompose-demo_redis_1,compose-demo_web_1
redis_1|1:C12Sep202007:34:09.654#oO0OoO0OoO0OoRedisisstartingoO0OoO0OoO0Oo
redis_1|1:C12Sep202007:34:09.655#Redisversion=6.0.7,bits=64,commit=00000000,modified=0,pid=1,juststarted
redis_1|1:C12Sep202007:34:09.655#Warning:noconfigfilespecified,usingthedefaultconfig.Inordertospecifyaconfigfileuseredis-server/path/to/redis.conf
redis_1|1:M12Sep202007:34:09.657*Runningmode=standalone,port=6379.
redis_1|1:M12Sep202007:34:09.657#WARNING:TheTCPbacklogsettingof511cannotbeenforcedbecause/proc/sys/net/core/somaxconnissettothelowervalueof128.
redis_1|1:M12Sep202007:34:09.657#Serverinitialized
redis_1|1:M12Sep202007:34:09.658#WARNINGovercommit_memoryissetto0!Backgroundsavemayfailunderlowmemorycondition.Tofixthisissueadd'vm.overcommit_memory=1'to/etc/sysctl.confandthenrebootorrunthecommand'sysctlvm.overcommit_memory=1'forthistotakeeffect.
redis_1|1:M12Sep202007:34:09.658*LoadingRDBproducedbyversion6.0.7
redis_1|1:M12Sep202007:34:09.658*RDBage156seconds
redis_1|1:M12Sep202007:34:09.658*RDBmemoryusagewhencreated0.77Mb
redis_1|1:M12Sep202007:34:09.658*DBloadedfromdisk:0.000seconds
web_1|*ServingFlaskapp"app.py"
web_1|*Environment:production
web_1|WARNING:Thisisadevelopmentserver.Donotuseitinaproductiondeployment.
web_1|UseaproductionWSGIserverinstead.
web_1|*Debugmode:off
YML文件规则
version:"1.0"#版本
services:#服务列表
service1:
#服务配置
container_name:#容器名称
depends_on:#依赖列表
-depend1
-depend2
images:#镜像
-image1
-image2
build:.#构建目录
network:#网络
......
service2:test2
......
volumnes:#挂载目录列表
networks:#网络列表
configs:#其他配置
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