SQL SERVER 2016 AlwaysOn 无域集群+负载均衡搭建与简测

2022-10-13 09:26:14

之前和很多群友聊天发现对2016的无域和负载均衡满心期待，毕竟可以简单搭建而且可以不适用第三方负载均衡器，SQL自己可以负载了。windows2016已经可以下载使用了，那么这回终于可以揭开令人憧憬向往的AlwaysOn2016 负载均衡集群的神秘面纱了。

　　本篇主要描述个人集群搭建中遇到的坑和一些注意事项，以及2016无域负载均衡的简单体验测试。

搭建体验

基础环境

　　想要不使用域环境来搭建AlwaysON 必须使用windows 2016 和sql server2016

　　本篇我使用3台虚拟机（主要是为了测试负载均衡，否则2台就可以），为了搭建的纯洁性，我3台机器都是独立安装，没有使用虚机复制。

遇到的问题

　　整体的系统，故障转移集群，AlwaysOn搭建都和2012和2014没有太大差别，所以这里只介绍几个搭建时的特殊注意点。

　　1.因为没有域所以需要在”计算机属性“添加计算机的DNS后缀。

　　2.需要做域名解析（域名解析运行——>drivers，每个节点都需要配置）

　　3.图形化创建会出现问题，导出脚本查看发现脚本不全

　　下面是创建AWO的脚本（前提是各个节点已经还原的备份文件）

　　注：以下脚本可以通过SSMS工具切换到SQLCMD模式运行

--- YOU MUST EXECUTE THE FOLLOWING SCRIPT IN SQLCMD MODE.
:Connect sql16node1

IF (SELECT state FROM sys.endpoints WHERE name = N'Hadr_endpoint') <> 
BEGIN
    ALTER ENDPOINT [Hadr_endpoint] STATE = STARTED
END


GO

use [master]

GO

GRANT CONNECT ON ENDPOINT::[Hadr_endpoint] TO [NT Service\MSSQLSERVER]

GO

:Connect sql16node1

IF EXISTS(SELECT * FROM sys.server_event_sessions WHERE name='AlwaysOn_health')
BEGIN
  ALTER EVENT SESSION [AlwaysOn_health] ON SERVER WITH (STARTUP_STATE=ON);
END
IF NOT EXISTS(SELECT * FROM sys.dm_xe_sessions WHERE name='AlwaysOn_health')
BEGIN
  ALTER EVENT SESSION [AlwaysOn_health] ON SERVER STATE=START;
END

GO

:Connect sql16node2

IF (SELECT state FROM sys.endpoints WHERE name = N'Hadr_endpoint') <> 
BEGIN
    ALTER ENDPOINT [Hadr_endpoint] STATE = STARTED
END


GO

use [master]

GO

GRANT CONNECT ON ENDPOINT::[Hadr_endpoint] TO [NT Service\MSSQLSERVER]

GO

:Connect sql16node2

IF EXISTS(SELECT * FROM sys.server_event_sessions WHERE name='AlwaysOn_health')
BEGIN
  ALTER EVENT SESSION [AlwaysOn_health] ON SERVER WITH (STARTUP_STATE=ON);
END
IF NOT EXISTS(SELECT * FROM sys.dm_xe_sessions WHERE name='AlwaysOn_health')
BEGIN
  ALTER EVENT SESSION [AlwaysOn_health] ON SERVER STATE=START;
END

GO

:Connect sql16node3

IF (SELECT state FROM sys.endpoints WHERE name = N'Hadr_endpoint') <> 
BEGIN
    ALTER ENDPOINT [Hadr_endpoint] STATE = STARTED
END


GO

use [master]

GO

GRANT CONNECT ON ENDPOINT::[Hadr_endpoint] TO [NT Service\MSSQLSERVER]

GO

:Connect sql16node3

IF EXISTS(SELECT * FROM sys.server_event_sessions WHERE name='AlwaysOn_health')
BEGIN
  ALTER EVENT SESSION [AlwaysOn_health] ON SERVER WITH (STARTUP_STATE=ON);
END
IF NOT EXISTS(SELECT * FROM sys.dm_xe_sessions WHERE name='AlwaysOn_health')
BEGIN
  ALTER EVENT SESSION [AlwaysOn_health] ON SERVER STATE=START;
END

GO

:Connect sql16node1

USE [master]

GO

CREATE AVAILABILITY GROUP [KK_AG_2016]
WITH (AUTOMATED_BACKUP_PREFERENCE = SECONDARY,
DB_FAILOVER = OFF,
DTC_SUPPORT = NONE)
FOR DATABASE [AWO_2016]
REPLICA ON N'SQL16NODE1' WITH (ENDPOINT_URL = N'TCP://SQL16NODE1:5022', FAILOVER_MODE = AUTOMATIC, AVAILABILITY_MODE = SYNCHRONOUS_COMMIT, BACKUP_PRIORITY = 50, SECONDARY_ROLE(ALLOW_CONNECTIONS = ALL)),
    N'SQL16NODE2' WITH (ENDPOINT_URL = N'TCP://SQL16NODE2:5022', FAILOVER_MODE = AUTOMATIC, AVAILABILITY_MODE = SYNCHRONOUS_COMMIT, BACKUP_PRIORITY = 50, SECONDARY_ROLE(ALLOW_CONNECTIONS = ALL)),
    N'SQL16NODE3' WITH (ENDPOINT_URL = N'TCP://SQL16NODE3:5022', FAILOVER_MODE = AUTOMATIC, AVAILABILITY_MODE = SYNCHRONOUS_COMMIT, BACKUP_PRIORITY = 50, SECONDARY_ROLE(ALLOW_CONNECTIONS = ALL));

GO

------------这部分代码是图形化工具中缺失的步骤
:Connect sql16node2

ALTER AVAILABILITY GROUP [KK_AG_2016] JOIN;

GO
ALTER DATABASE [AWO_2016] SET HADR AVAILABILITY GROUP = [KK_AG_2016];
GO

:Connect sql16node3

ALTER AVAILABILITY GROUP [KK_AG_2016] JOIN;

GO
ALTER DATABASE [AWO_2016] SET HADR AVAILABILITY GROUP = [KK_AG_2016];
GO

创建监听

:Connect sql16node1

USE [master]

GO

ALTER AVAILABILITY GROUP [KK_AG_2016]
ADD LISTENER N'L_KK_AWO2016' (
WITH IP
((N'192.168.3.121', N'255.255.255.0')
)
, PORT=8000);

GO

测试

高可用测试

　　简单的看起来与之前没有什么差别，依然依赖故障转移群集，仲裁的的方式与2012R2基本相同，可以使用仲裁磁盘、仲裁文件夹或动态节点投票（偶数个节点依然会动态分配投票权），值得关注的是在windows2016的集群中添加了云仲裁，这个云端配置先不说，真是对于之前配置的跨机房的集群的福音。

负载均衡测试

配置负载均衡（此处只是简单的做了一下主节点的负载）

alter availability group kk_ag_2016
modify replica on 'sql16node1'
with
(
primary_role
(
read_only_routing_list = (('sql16node2','sql16node3'),'sql16node1')
)
)



alter availability group kk_ag_2016
modify replica on N'sql16node1'
with
(
    secondary_role (read_only_routing_url = N'tcp://sql16node1.kk.com:1433')
)
go
alter availability group kk_ag_2016
modify replica on N'sql16node2'
with
(
    secondary_role (read_only_routing_url = N'tcp://sql16node2.kk.com:1433')
)
go
alter availability group kk_ag_2016
modify replica on N'sql16node3'
with
(
    secondary_role (read_only_routing_url = N'tcp://sql16node3.kk.com:1433')
)
go