問題解決

1. 問題一：server 斷電不正常關機後，無法正常啟動。

   [root@ldap ~]# /etc/init.d/slapd restart
   Stopping slapd:                                            [FAILED]
   Checking configuration files for slapd:                    [FAILED]
   bdb_db_open: database "...": unclean shutdown detected; attempting recovery.
   bdb_db_open: database "...": recovery skipped in read-only mode. 
   Run manual recovery if errors are encountered.
   stale lock files may be present in /var/lib/ldap           [WARNING]
   

2. 解決方式：

   [root@ldap ~]# /etc/init.d/slapd stop
   Stopping slapd:                                            [FAILED]
   
   [root@ldap ~]# /usr/sbin/slapd_db_recover -v -h /var/lib/ldap/
   Finding last valid log LSN: file: 2 offset 5681155
   Recovery starting from [2][5680260]
   Recovery complete at Sat Aug 17 13:03:49 2019
   Maximum transaction ID 80000013 Recovery checkpoint [2][5681950]
   
   [root@ldap ~]# /etc/init.d/slapd start
   Checking configuration files for slapd:                    [WARNING]
   bdb_db_open: database "...": unclean shutdown detected; attempting recovery.
   bdb_db_open: database "...": recovery skipped in read-only mode. 
   Run manual recovery if errors are encountered.
   config file testing succeeded
   Starting slapd:                                            [  OK  ]
   
   [root@ldap ~]# /etc/init.d/slapd restart
   Stopping slapd:                                            [  OK  ]
   Starting slapd:                                            [  OK  ]