yum安装某个软件的时候，出现报错
[root@aws ~]# yum install -y zabbix-agent
rpmdb: unable to join the environment
error: db3 error(11) from dbenv->open: Resource temporarily unavailable
error: cannot open Packages index using db3 - Resource temporarily unavailable (11)
error: cannot open Packages database in /var/lib/rpm
CRITICAL:yum.main:
Error: rpmdb open failed 《===###报错啦
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解决报错：
[root@aws ~]# cd /var/lib/rpm/
[root@aws rpm]# ls
Basenames Dirnames Installtid Packages Pubkeys Sha1header
Conflictname Filedigests Name Providename Requirename Sigmd5
__db.001 Group Obsoletename Provideversion Requireversion Triggername
[root@aws rpm]# rm __db.* -rf ###删除rpm原始数据
[root@aws rpm]# rpm --rebuilddb ###重建rpm数据
[root@aws rpm]# yum clean all ###清除yum仓库缓存
Loaded plugins: presto, security
Cleaning repos: ultra-centos-6.8-base ultra-centos-6.8-extras ultra-centos-6.8-updates
: ultra-centos-6.x-glusterfs ultra-centos-6.x-java ultra-centos-6.x-ultrarepo
Cleaning up Everything
0 delta-package files removed, by presto
[root@aws rpm]# yum update ###更新yum仓库源之后就可以正常使用了原文：http://blog.51cto.com/leoheng/2333620