NSQ Docker集群 [英] NSQ Docker Swarm

问题描述

我试图在Docker Swarm中使用NSQ失败

I'm trying to use NSQ in Docker Swarm without success

mhlg/rpi-nsq是为Raspberry Pi ARM7开发板构建的Docker映像，我可以确认如果作为普通Docker容器运行，它可以正常工作

mhlg/rpi-nsq is a Docker image built for the Raspberry Pi ARM7 board and I can confirm is working correctly if run as a normal Docker container

在Docker中运行NSQ(确定)

Running NSQ in Docker (OK)

# crete a bridged network
$ docker network create nsq_network

# run lookupd
$ docker run --name nsqlookupd --network nsq_network -p 4160:4160 -p 4161:4161 mhlg/rpi-nsq nsqlookupd

# run nsqd
$ docker run --name nsqd --network nsq_network -p 4150:4150 -p 4151:4151 mhlg/rpi-nsq nsqd --broadcast-address=nsqd --lookupd-tcp-address=nsqlookupd:4160

# run nsqadmin
$ docker run --name nsqadmin --network nsq_network -p 4171:4171  mhlg/rpi-nsq nsqadmin --lookupd-http-address=nsqlookupd:4161

以Docker Swarm模式运行NSQ(FAIL) 这就是我在群管理器中所做的

Running NSQ in Docker Swarm mode (FAIL) this is what I'm doing in the swarm manager

# crete an overlay network
$ docker network create nsq_network

# run nsqlookupd
$ docker service create --replicas 1 --name nsqlookupd --network nsq_network -p 4160:4160 -p 4161:4161 mhlg/rpi-nsq nsqlookupd

# run nsqd
$ docker service create --replicas 1 --name nsqd --network nsq_network -p 4150:4150 -p 4151:4151 mhlg/rpi-nsq nsqd --lookupd-tcp-address=nsqlookupd:4160 --broadcast-address=nsqd

# run nsqadmin
$ docker service create --replicas 1 --name nsqadmin --network nsq_network -p 4171:4171  mhlg/rpi-nsq nsqadmin --lookupd-http-address=nsqlookupd:4161

如果我附加到nsqd服务，则可以看到它无法连接到nsqlookupd服务.

If I attach to the nsqd service I can see it is not able to connect to nsqlookupd service.

[nsqd] 2016/12/09 16:51:56.851953 LOOKUPD(nsqlookupd:4160): sending heartbeat
[nsqd] 2016/12/09 16:51:56.852049 LOOKUP connecting to nsqlookupd:4160
[nsqd] 2016/12/09 16:51:57.852457 LOOKUPD(nsqlookupd:4160): ERROR PING - dial tcp: i/o timeout

看起来覆盖网络会产生一些问题(多播?)，但是我想不出如何解决它，尤其是在ARM设备上.

It looks like the overlay network create some issues (multicast?) but I can not figure how I can solve it especially on an ARM device.

我试图通过SSH进入运行nsqd服务的Docker主机并从nsqd容器内部执行一些dns命令

I tried to ssh into the Docker Host running the nsqd service and exec some dns commands from inside the nsqd container

# resolve google.com (OK)
root@3206d1c3cd3d:/# nslookup google.com
Server:     127.0.0.11
Address:    127.0.0.11#53

Non-authoritative answer:
Name:   google.com
Address: 216.58.214.78

# resolve nsqd service (OK) - can resolve the container I'm executing the command from
root@e1f6430acd1c:/# nslookup nsqd
Server:     127.0.0.11
Address:    127.0.0.11#53

Non-authoritative answer:
Name:   nsqd
Address: 10.0.0.2

# resolve nsqlookupd service (FAIL)
root@e1f6430acd1c:/# nslookup nsqlookupd
;; connection timed out; no servers could be reached

推荐答案

在docker swarm中遇到相同的问题.这是我解决的方法:

Ran into the same exact issue in docker swarm. This is how I resolved it:

docker service create \
--mode global \
--name swarm-master-nsq_nsqlookupd \
--constraint node.role==manager \
--hostname nsqlookupd \
--network name=swarm-master-nsq_nsq,alias=nsqlookupd \
nsqio/nsq:latest /nsqlookupd


docker service create \
--replicas 3 \
--name swarm-master-nsq_nsqd \
--constraint node.role==manager \
--hostname nsqd \
--network name=swarm-master-nsq_nsq,alias=nsqd \
nsqio/nsq:latest sh -c '/nsqd --broadcast-address=$(hostname -i) --lookupd-tcp-address=nsqlookupd:4160'


docker service create \
--replicas 1 \
--publish 4171:4171 \
--name swarm-master-nsq_nsqadmin \
--constraint node.role==manager \
--hostname nsqadmin \
--network name=swarm-master-nsq_nsq,alias=nsqadmin \
nsqio/nsq:latest /nsqadmin --lookupd-http-address=nsqlookupd:4161

据我所知，您的示例中有几个问题:

As far as I can tell, there are a couple issues in your example:

1. 您没有为nsqlookupd和其他服务加上别名
2. nsqd的广播不正确(假设您想在某个时候增加nsqd节点的数量)

这篇关于NSQ Docker集群的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！