数据库的机器突然kernel panic了，导致openldap的数据文件损坏，BDB报错。
Aug 26 11:00:32 db5 slapd[14029]: bdb(dc=chinabank,dc=com): Program version 4.2 doesn't match environment version
Aug 26 11:00:32 db5 slapd[14029]: bdb_db_open: dbenv_open failed: Invalid argument (22)
Aug 26 11:00:32 db5 slapd[14029]: backend_startup: bi_db_open(0) failed! (22)
修复方法：
cd /var/lib/
db_recover -v -h ldap (路径)
或者slapd_db_recover -v -h ldap
ldap的备份与导出：
slapcat > 1.ldif
slapadd < 1.ldif
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