文章原地址 https://techglimpse.com/openstack-db-sync-error-mysql-character-set-solution/

执行

# su -s /bin/sh -c "keystone-manage db_sync" keystone

时出现错误：CRITICAL keystone [-] DBError: (pyMysqL.err.InternalError) (1071,u'Specified key was too long; max key length is 767 bytes') [sql: u'\nCREATE TABLE migrate_version (\n\trepository_id VARCHAR(250) NOT NULL,\n\trepository_path TEXT,\n\tversion INTEGER,\n\tPRIMARY KEY (repository_id)\n)\n\n']

Overall,you need to perform below steps:

1. Replace utf8mb4 to utf8in all configuration files
2. ReloadMysqLddaemon
3. Drop databasekeystone or glance or nova or neutron(for whichever service you were getting error and don’t worry,you haven’t populated the database yet and it’s safe to remove)
4. Create databasekeystone or glance or nova or neutron
5. Try db_sync or populate the database using OpenStack commands. It should probably work,else try Fix 2.

1.将/etc/MysqL/mariadb.conf.d目录下的所有.cnf文件中出现uft8mb4的地方都修改成uft8

2.重启数据库 service MysqL restart

3.进入数据库把建立的keystone数据库删除

4.重新建立keystone数据库

5.输入su -s /bin/sh -c "keystone-manage db_sync" keystone 应该就可以运行了，不行的话实时Fix2.

同时推荐文章http://blog.csdn.net/zhujie_hades/article/details/52104116