/usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/ cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/ mkdir /etc/keepalived 2.4.7 Keepalived 的配置 2.4.7.1 Master 的 keepalived 的配置 Master 和 backup 是一致的，脚本内容如下： vim /etc/rc.d/init.d/realserver.sh #!/bin/bash # description: Config realserver lo and apply noarp SNS_VIP=10.1.1.176 /etc/rc.d/init.d/functions case "$1" in start) keepalived 和 realserver 脚本： /etc/rc.d/init.d/realserver.sh start /etc/rc.d/init.d/keepalived start 并将 keepalived 和 realserver 的启动脚本加入到 rc.local 自启动中： echo “/etc/rc.d/init.d/realserver.sh start” >> /etc/rc

0000102/error.log: no such file or directory E1027 18:28:23.464117 19486 mysqlctl.go:254] failed init mysql: /usr/sbin/mysqld: exit status 1, output: mysqld: [ERROR] Failed to open required defaults 0000102/error.log: no such file or directory E1027 18:28:23.464117 19486 mysqlctl.go:254] failed init mysql: /usr/sbin/mysqld: exit status 1, output: mysqld: [ERROR] Failed to open required defaults Can I override the default db name from vt_xxx to my own? Yes. You can start vttablet with the -init_db_name_override command line option to specify a different db name. There is no downside to performing

0000102/error.log: no such file or directory E1027 18:28:23.464117 19486 mysqlctl.go:254] failed init mysql: /usr/sbin/mysqld: exit status 1, output: mysqld: [ERROR] Failed to open required defaults 0000102/error.log: no such file or directory E1027 18:28:23.464117 19486 mysqlctl.go:254] failed init mysql: /usr/sbin/mysqld: exit status 1, output: mysqld: [ERROR] Failed to open required defaults Can I override the default db name from vt_xxx to my own? Yes. You can start vttablet with the -init_db_name_override command line option to specify a different db name. There is no downside to performing

0000102/error.log: no such file or directory E1027 18:28:23.464117 19486 mysqlctl.go:254] failed init mysql: /usr/sbin/mysqld: exit status 1, output: mysqld: [ERROR] Failed to open required defaults 0000102/error.log: no such file or directory E1027 18:28:23.464117 19486 mysqlctl.go:254] failed init mysql: /usr/sbin/mysqld: exit status 1, output: mysqld: [ERROR] Failed to open required defaults files. tabletID: zone -1234 init: dbName: # init_db_name_override keyspace: # init_keyspace shard: # init_shard tabletType: # init_tablet_type timeoutSeconds: 60 # init_timeout db: socket: # db_socket

0000102/error.log: no such file or directory E1027 18:28:23.464117 19486 mysqlctl.go:254] failed init mysql: /usr/sbin/mysqld: exit status 1, output: mysqld: [ERROR] Failed to open required defaults 0000102/error.log: no such file or directory E1027 18:28:23.464117 19486 mysqlctl.go:254] failed init mysql: /usr/sbin/mysqld: exit status 1, output: mysqld: [ERROR] Failed to open required defaults files. tabletID: zone -1234 init: dbName: # init_db_name_override keyspace: # init_keyspace shard: # init_shard tabletType: # init_tablet_type timeoutSeconds: 60 # init_timeout db: socket: # db_socket

0000102/error.log: no such file or directory E1027 18:28:23.464117 19486 mysqlctl.go:254] failed init mysql: /usr/sbin/mysqld: exit status 1, output: mysqld: [ERROR] Failed to open required defaults 0000102/error.log: no such file or directory E1027 18:28:23.464117 19486 mysqlctl.go:254] failed init mysql: /usr/sbin/mysqld: exit status 1, output: mysqld: [ERROR] Failed to open required defaults files. tabletID: zone -1234 init: dbName: # init_db_name_override keyspace: # init_keyspace shard: # init_shard tabletType: # init_tablet_type timeoutSeconds: 60 # init_timeout db: socket: # db_socket

0000102/error.log: no such file or directory E1027 18:28:23.464117 19486 mysqlctl.go:254] failed init mysql: /usr/sbin/mysqld: exit status 1, output: mysqld: [ERROR] Failed to open required defaults 0000102/error.log: no such file or directory E1027 18:28:23.464117 19486 mysqlctl.go:254] failed init mysql: /usr/sbin/mysqld: exit status 1, output: mysqld: [ERROR] Failed to open required defaults files. tabletID: zone -1234 init: dbName: # init_db_name_override keyspace: # init_keyspace shard: # init_shard tabletType: # init_tablet_type timeoutSeconds: 60 # init_timeout db: socket: # db_socket

= ‘init’; INSERT INTO t_order_item (order_id , user_id , sta‐ tus , creation_date)VALUES (1, 1,‘insert’, ‘2017‐08‐08’), (2, 2,‘insert’,‘2017‐08‐08’ )ON DUPLICATE KEY UPDATE status = ‘init’; sharding ecosystem. 3.2. Distributed Transaction 64 Apache ShardingSphere document, v5.0.0-beta Init Seata Engine When an application containing ShardingTransactionBaseSeataAT startup, the user‐configured SkywalkingTracer Call initialization method ShardingTracer.init(); • Method 2: inject Tracer provided by APM through parameter ShardingTracer.init(new SkywalkingTracer()); Notice: when using SkyWalking

并使⽤ GET 命令来从指定的字符串键⾥⾯获取被缓存的数据。 代码清单 2-1 使⽤字符串键实现的缓存程序：/string/cache.py class Cache: def __init__(self, client): self.client = client def set(self, key, value): """ 成的。 代码清单 2-2 使⽤字符串键实现的锁程序：/string/lock.py VALUE_OF_LOCK = "locking" class Lock: def __init__(self, client, key): self.client = client self.key = key def acquire(self): ⽂章储存程序：/string/article.py from time import time # time() 函数⽤于获取当前 Unix 时间戳 class Article: def __init__(self, client, article_id): self.client = client self.id = str(article_id)

265 7.2.3 Seata BASE transaction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265 Init Seata Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266 Transaction SkywalkingTracer Call initialization method ShardingTracer.init(); • Method 2: inject Tracer provided by APM through parameter ShardingTracer.init(new SkywalkingTracer()); Notice: when using SkyWalking prepareStatement("INSERT INTO t_order (user_id, status) VALUES (?, ?)"); ps.setObject(1, 1000); ps.setObject(2, "init"); ps.executeUpdate(); conn.commit(); } 5.1. ShardingSphere-JDBC 81 Apache ShardingSphere document