AWS上的Ansible脚本dpkg锁定启动ubuntu 16.04

Question

我有一个启动脚本（用户数据），该脚本在具有ubuntu 16.04映像的aws中启动时运行，而我遇到的问题是，当它到达运行ansible剧本的那一部分时，该剧本会失败，并显示此基本错误消息Could not get lock /var/lib/dpkg/lock。现在，当我登录并尝试手动运行ansible脚本时，它可以工作，但是如果我从aws用户数据中运行它，它将失败并显示错误。

这是完整的错误

TASK [rabbitmq : install packages (Ubuntu default repo is used)] ***************
task path: /etc/ansible/roles/rabbitmq/tasks/main.yml:50
<localhost> ESTABLISH LOCAL CONNECTION FOR USER: root
<localhost> EXEC /bin/sh -c '( umask 77 && mkdir -p "` echo $HOME/.ansible/tmp/ansible-tmp-1480352390.01-116502531862586 `" && echo ansible-tmp-1480352390.01-116502531862586="` echo $HOME/.ansible/tmp/ansible-tmp-1480352390.01-116502531862586 `" ) && sleep 0'
<localhost> PUT /tmp/tmpGHaVRP TO /.ansible/tmp/ansible-tmp-1480352390.01-116502531862586/apt
<localhost> EXEC /bin/sh -c 'chmod u+x /.ansible/tmp/ansible-tmp-1480352390.01-116502531862586/ /.ansible/tmp/ansible-tmp-1480352390.01-116502531862586/apt && sleep 0'
<localhost> EXEC /bin/sh -c 'LANG=en_US.UTF-8 LC_ALL=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 /usr/bin/python /.ansible/tmp/ansible-tmp-1480352390.01-116502531862586/apt; rm -rf "/.ansible/tmp/ansible-tmp-1480352390.01-116502531862586/" > /dev/null 2>&1 && sleep 0'
fatal: [localhost]: FAILED! => {"cache_update_time": 0, "cache_updated": 
false, "changed": false, "failed": true, "invocation": {"module_args": 
{"allow_unauthenticated": false, "autoremove": false, "cache_valid_time": 
null, "deb": null, "default_release": null, "dpkg_options": "force-
confdef,force-confold", "force": false, "install_recommends": null, "name": 
"rabbitmq-server", "only_upgrade": false, "package": ["rabbitmq-server"], 
"purge": false, "state": "present", "update_cache": false, "upgrade": null}, 
"module_name": "apt"}, "msg": "'/usr/bin/apt-get -y -o \"Dpkg::Options::=--
force-confdef\" -o \"Dpkg::Options::=--force-confold\"     install 
'rabbitmq-server'' failed: E: Could not get lock /var/lib/dpkg/lock - open 
(11: Resource temporarily unavailable)\nE: Unable to lock the administration 
directory (/var/lib/dpkg/), is another process using it?\n", "stderr": "E:     Could 
not get lock /var/lib/dpkg/lock - open (11: Resource temporarily 
unavailable)\nE: Unable to lock the administration directory (/var/lib/dpkg/), 
is another process using it?\n", "stdout": "", "stdout_lines": []}

Answer 1

我遇到了相同的锁定问题。我发现ubuntu在首次启动时安装了一些包，而cloud-init并没有等待它们。

我尝试使用以下脚本来检查锁定文件至少15秒钟是否可用，然后再尝试安装任何内容。

#!/bin/bash

i="0"
while [ $i -lt 15 ] 
do 
if [ $(fuser /var/lib/dpkg/lock) ]; then 
  i="0" 
fi 
sleep 1 
i=$[$i+1] 
done

我之所以喜欢它，sleep 5m是因为在自动伸缩组中，该实例甚至可能在配置之前就被删除了。