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刚才，我在更新我的一台aws服务器的时候，在使用yum upgrade更新的时候提示有几处错误，因为这个问题也折腾也好一会，所以现在在这里也写出解决方法，以免以后遇到类似问题的朋友们可以参考。
[root@ip- centos]# rpm -q centos-release centos-release-7-9.2009.1.el7.centos.x86_64 [root@ip- centos]# yum upgrade -y Loaded plugins: fastestmirror Determining fastest mirrors epel/x86_64/metalink | 6.1 kB 00:00:00 * base: download.cf.centos.org * epel: d2lzkl7pfhq30w.cloudfront.net * extras: download.cf.centos.org * updates: download.cf.centos.org base | 3.6 kB 00:00:00 epel | 4.7 kB 00:00:00 extras | 2.9 kB 00:00:00 updates | 2.9 kB 00:00:00 (1/5): epel/x86_64/updateinfo | 1.1 MB 00:00:00 (2/5): epel/x86_64/group_gz | 96 kB 00:00:00 (3/5): epel/x86_64/primary_db | 7.0 MB 00:00:00 (4/5): extras/7/x86_64/primary_db | 246 kB 00:00:00 (5/5): updates/7/x86_64/primary_db | 14 MB 00:00:00 Resolving Dependencies --> Running transaction check ---> Package bind-export-libs.x86_64 32:9.11.4-26.P2.el7_9.8 will be updated ---> Package bind-export-libs.x86_64 32:9.11.4-26.P2.el7_9.9 will be an update ---> Package cloud-init.x86_64 0:19.4-7.el7.centos.5 will be updated ---> Package cloud-init.x86_64 0:19.4-7.el7.centos.6 will be an update ---> Package cyrus-sasl-lib.x86_64 0:2.1.26-23.el7 will be updated ---> Package cyrus-sasl-lib.x86_64 0:2.1.26-24.el7_9 will be an update ---> Package kernel.x86_64 0:3.10.0-1160.59.1.el7 will be installed ---> Package kernel-debug-devel.x86_64 0:3.10.0-1160.53.1.el7 will be updated ---> Package kernel-debug-devel.x86_64 0:3.10.0-1160.59.1.el7 will be an update ---> Package kernel-headers.x86_64 0:3.10.0-1160.53.1.el7 will be updated ---> Package kernel-headers.x86_64 0:3.10.0-1160.59.1.el7 will be an update ---> Package kernel-tools.x86_64 0:3.10.0-1160.53.1.el7 will be updated ---> Package kernel-tools.x86_64 0:3.10.0-1160.59.1.el7 will be an update ---> Package kernel-tools-libs.x86_64 0:3.10.0-1160.53.1.el7 will be updated ---> Package kernel-tools-libs.x86_64 0:3.10.0-1160.59.1.el7 will be an update ---> Package openldap.x86_64 0:2.4.44-24.el7_9 will be updated ---> Package openldap.x86_64 0:2.4.44-25.el7_9 will be an update ---> Package python-perf.x86_64 0:3.10.0-1160.53.1.el7 will be updated ---> Package python-perf.x86_64 0:3.10.0-1160.59.1.el7 will be an update Killed
遇到以上问题的时候，假如在使用yum的过程中提示Killed错误字样，那么多半是提示系统内存不足，我的解决方法是reboot重启系统，问题解决。
[root@ip- centos]# yum clean all error: rpmdb: BDB0113 Thread/process 13435/139990340708160 failed: BDB1507 Thread died in Berkeley DB library error: db5 error(-30973) from dbenv->failchk: BDB0087 DB_RUNRECOVERY: Fatal error, run database recovery error: cannot open Packages index using db5 - (-30973) error: cannot open Packages database in /var/lib/rpm CRITICAL:yum.main: Error: rpmdb open failed [root@ip- centos]# yum makecache error: rpmdb: BDB0113 Thread/process 13435/139990340708160 failed: BDB1507 Thread died in Berkeley DB library error: db5 error(-30973) from dbenv->failchk: BDB0087 DB_RUNRECOVERY: Fatal error, run database recovery error: cannot open Packages index using db5 - (-30973) error: cannot open Packages database in /var/lib/rpm CRITICAL:yum.main: Error: rpmdb open failed
提示以上错误的时候，是因为数据库缓存出了问题，请执行以下删除命令进行删除几个数据库文件。
[root@ip- centos]# ls -l /var/lib/rpm/ total 106344 -rw-r--r--. 1 root root 3076096 Feb 11 16:41 Basenames -rw-r--r--. 1 root root 8192 Feb 11 16:41 Conflictname -rw-r--r-- 1 root root 270336 Mar 15 11:59 __db.001 -rw-r--r-- 1 root root 81920 Mar 15 11:59 __db.002 -rw-r--r-- 1 root root 1318912 Mar 15 11:59 __db.003 -rw-r--r--. 1 root root 1523712 Feb 11 16:41 Dirnames -rw-r--r--. 1 root root 16384 Feb 11 16:41 Group -rw-r--r--. 1 root root 12288 Feb 11 16:41 Installtid -rw-r--r--. 1 root root 28672 Feb 11 16:41 Name -rw-r--r--. 1 root root 16384 Feb 11 13:27 Obsoletename -rw-r--r--. 1 root root 100032512 Feb 11 16:41 Packages -rw-r--r--. 1 root root 2371584 Feb 11 16:41 Providename -rw-r--r--. 1 root root 176128 Feb 11 16:41 Requirename -rw-r--r--. 1 root root 49152 Feb 11 16:41 Sha1header -rw-r--r--. 1 root root 32768 Feb 11 16:41 Sigmd5 -rw-r--r--. 1 root root 8192 Feb 11 12:37 Triggername
当出现 _db.的文件的时候，执行任何yum命令都会出错，所以这里我们需要删除这几个文件。
[root@ip- ~]# rpm -q kernel BDB2053 Freeing read locks for locker 0x10: 14312/140020965660480 BDB2053 Freeing read locks for locker 0x12: 14312/140020965660480 BDB2053 Freeing read locks for locker 0x13: 14312/140020965660480 BDB2053 Freeing read locks for locker 0x14: 14312/140020965660480 BDB2053 Freeing read locks for locker 0x15: 14312/140020965660480 kernel-3.10.0-1160.el7.x86_64 kernel-3.10.0-1160.15.2.el7.x86_64 kernel-3.10.0-1160.53.1.el7.x86_64
[root@ip- ~]# rm -rf /var/lib/rpm/__db.* [root@ip- ~]# ls -l /var/lib/rpm/ total 104844 -rw-r--r--. 1 root root 3076096 Feb 11 16:41 Basenames -rw-r--r--. 1 root root 8192 Feb 11 16:41 Conflictname -rw-r--r--. 1 root root 1523712 Feb 11 16:41 Dirnames -rw-r--r--. 1 root root 16384 Feb 11 16:41 Group -rw-r--r--. 1 root root 12288 Feb 11 16:41 Installtid -rw-r--r--. 1 root root 28672 Feb 11 16:41 Name -rw-r--r--. 1 root root 16384 Feb 11 13:27 Obsoletename -rw-r--r--. 1 root root 100032512 Feb 11 16:41 Packages -rw-r--r--. 1 root root 2371584 Feb 11 16:41 Providename -rw-r--r--. 1 root root 176128 Feb 11 16:41 Requirename -rw-r--r--. 1 root root 49152 Feb 11 16:41 Sha1header -rw-r--r--. 1 root root 32768 Feb 11 16:41 Sigmd5 -rw-r--r--. 1 root root 8192 Feb 11 12:37 Triggername [root@ip- ~]# yum clean all
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