eval $(docker-machine env <计算机名称>)似乎可以在Shell脚本中工作,但立即失败

时间:2019-06-12 12:20:36

标签: bash docker docker-compose eval docker-machine

要在macOS High Sierra上为Docker设置大量VM(使用Docker Desktop 2.0.5.0,但这在以前的版本中已发生。)我运行以下shell脚本:

#!/bin/bash

# some variables
MANAGER="swarmMGR"
WORKER="swarmWKR"
MAXNODE=3

# create VMs for swarm
# manager
docker-machine create --driver virtualbox $MANAGER
# workers
for (( i=1; i<=$MAXNODE; i++ ))
do
    docker-machine create --driver virtualbox $WORKER$i
done

# find the manager's IP address
MANAGERIP=$(docker-machine ls | grep $MANAGER | egrep -o '([0-9]{1,3}[.]){3}[0-9]{1,3}')

# initialize the swarm
docker-machine ssh ${MANAGER} "docker swarm init --advertise-addr $MANAGERIP"

# workers join the swarm
# get the token
TOKEN=$(docker-machine ssh $MANAGER "docker swarm join-token worker -q")
# join up
for (( i=1; i<=$MAXNODE; i++ ))
do
    echo 
    docker-machine ssh $WORKER$i "docker swarm join --token ${TOKEN} ${MANAGERIP}"
done

# configure the shell to expose the manager for Docker commands from the host
eval $(docker-machine env $MANAGER)

# list the machines
docker-machine ls

# list the nodes
docker-machine ssh $MANAGER "docker node ls"

eval $(docker-machine env $MANAGER)似乎可以正常工作-这是脚本结尾处的输出:

NAME        ACTIVE   DRIVER       STATE     URL                         SWARM   DOCKER     ERRORS
swarmMGR    *        virtualbox   Running   tcp://192.168.99.197:2376           v18.09.6
swarmWKR1   -        virtualbox   Running   tcp://192.168.99.198:2376           v18.09.6
swarmWKR2   -        virtualbox   Running   tcp://192.168.99.199:2376           v18.09.6
swarmWKR3   -        virtualbox   Running   tcp://192.168.99.200:2376           v18.09.6
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
ub2qbyd6ca8yzgsq1f0mjsp0i *   swarmMGR            Ready               Active              Leader              18.09.6
dopxb7bgyixqyh3z66rvtik2o     swarmWKR1           Ready               Active                                  18.09.6
vwbd11l36idnphdsoutls2hvp     swarmWKR2           Ready               Active                                  18.09.6
oe80ejzvnhsmhosvjvus6cvb1     swarmWKR3           Ready               Active                                  18.09.6

如果我执行一个简单的命令,说docker node ls,它现在应该在集群管理器上运行,则会出现以下错误:

  

守护程序的错误响应:该节点不是群集管理器。使用“ docker swarm init”或“ docker swarm join”将此节点连接到swarm并重试。

如果我手动运行eval()命令,响应将正确。我做了很多研究,找不到解决该问题的方法。

从脚本运行eval()命令时是否需要做些什么才能使其正常工作?

其他信息

我使用-x选项运行了有问题的Shell脚本部分,以输出一些调试信息:

#!/bin/bash

MANAGER="swarmMGR"

# configure the shell to expose the manager for Docker commands from the host
eval $(docker-machine env "$MANAGER")

# list the machines
docker-machine ls

# list the nodes
docker-machine ssh $MANAGER "docker node ls"

echo $DOCKER_HOST

以下是输出:

$ bash -x ./export.sh
+ MANAGER=swarmMGR
++ docker-machine env swarmMGR
+ eval export 'DOCKER_TLS_VERIFY="1"' export 'DOCKER_HOST="tcp://192.168.99.228:2376"' export 'DOCKER_CERT_PATH="/Users/foo/.docker/machine/machines/swarmMGR"' export 'DOCKER_MACHINE_NAME="swarmMGR"' '#' Run this command to configure your shell: '#' eval '$(docker-machine' env 'swarmMGR)'
++ export DOCKER_TLS_VERIFY=1 export DOCKER_HOST=tcp://192.168.99.228:2376 export DOCKER_CERT_PATH=/Users/foo/.docker/machine/machines/swarmMGR export DOCKER_MACHINE_NAME=swarmMGR
++ DOCKER_TLS_VERIFY=1
++ DOCKER_HOST=tcp://192.168.99.228:2376
++ DOCKER_CERT_PATH=/Users/jblanchard/.docker/machine/machines/swarmMGR
++ DOCKER_MACHINE_NAME=swarmMGR
+ docker-machine ls
NAME        ACTIVE   DRIVER       STATE     URL                         SWARM   DOCKER     ERRORS
swarmMGR    *        virtualbox   Running   tcp://192.168.99.228:2376           v18.09.6
swarmWKR1   -        virtualbox   Running   tcp://192.168.99.229:2376           Unknown    Unable to query docker version: Cannot connect to the docker engine endpoint
swarmWKR2   -        virtualbox   Running   tcp://192.168.99.230:2376           v18.09.6
swarmWKR3   -        virtualbox   Running   tcp://192.168.99.231:2376           v18.09.6
+ docker-machine ssh swarmMGR 'docker node ls'
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
ryplgfjntuj7rfoapbl0bb8nj *   swarmMGR            Ready               Active              Leader              18.09.6
n89x4phb9jhilwz74zgta352r     swarmWKR2           Ready               Active                                  18.09.6
sp76b5vws2fcdpjuhxcqhywh3     swarmWKR3           Ready               Active                                  18.09.6
+ echo tcp://192.168.99.228:2376
tcp://192.168.99.228:2376

只要脚本是“活动的”,就可以正确设置环境变量。当脚本退出时,然后在从命令行运行echo $DOCKER_HOST后立即取消设置变量,不会产生任何结果。

1 个答案:

答案 0 :(得分:0)

当我继续研究问题时,终于在this question的AskUbuntu上找到了答案。事实证明,在脚本运行期间导出的环境变量不会持续存在。要纠正我需要做的所有事情,就是使用source运行脚本,这将导致导出的环境变量持续存在直到被取消设置:

await

或使用快捷方式

setState()