SQL Server High Availability Groups in Linux CentOS 7

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Configure pipeline

• Installing SQL Server High Availability Package
• Installing and Enabling SQL Server Agent if its not installed and enabled already
• Enable SQL server High Availability on each Node
• Creating AG Group EndPoint and Certificates
• Copy Certificates of each node into all other Nodes
• Change ownership and group association to mysql(User)
• Restore each Certificate with authenticated user ( create user if you don't have already one)
• Grant AG Group using SSMS
• Create SQL Server Login and Permission for Pacemaker
• Create Availability Group resource in pacemaker
• Create IP for Listener in PackeMaker
• Create Listener using same IP
• Test Failover

# Install SQL Server High Availability Package

sudo yum install mssql-server-ha

# Enable AlwaysOn Avaiability Groups and resetart SQL Server on both nodes

sudo /opt/mssql/bin/mssql-conf set hadr.hadrenabled  1
sudo systemctl restart mssql-server

# Open SSMS and create Certificate for each node

# Node Name : TBSLinuxNode1

CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'Pass@123';

GO

CREATE CERTIFICATE TBSLinuxNode1_Cert
WITH SUBJECT = 'TBSLinuxNode1 AG Certificate';

GO

BACKUP CERTIFICATE TBSLinuxNode1_Cert
TO FILE = '/var/opt/mssql/data/TBSLinuxNode1_Cert.cer';

GO

CREATE ENDPOINT TBSSQLAG
STATE = STARTED
AS TCP (
    LISTENER_PORT = 5022,
    LISTENER_IP = ALL)
FOR DATABASE_MIRRORING (
    AUTHENTICATION = CERTIFICATE TBSLinuxNode1_Cert,
    ROLE = ALL);

GO

#Now samething on Node2 (TBSLinuxNode2)


CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'Pass@123';

GO

CREATE CERTIFICATE TBSLinuxNode2_Cert
WITH SUBJECT = 'TBSLinuxNode2 AG Certificate';

GO

BACKUP CERTIFICATE TBSLinuxNode2_Cert
TO FILE = '/var/opt/mssql/data/TBSLinuxNode2_Cert.cer';

GO

CREATE ENDPOINT TBSSQLAG
STATE = STARTED
AS TCP (
    LISTENER_PORT = 5022,
    LISTENER_IP = ALL)
FOR DATABASE_MIRRORING (
    AUTHENTICATION = CERTIFICATE TBSLinuxNode2_Cert,
    ROLE = ALL);

GO

# Copy Certificate of one node to other using SCP 
# on Node1

scp -r root@TBSLinuxNode1:/var/opt/mssql/data/TBSLinuxNode1_Cert.cer 

root@TBSLinuxNode2:/var/opt/mssql/data/TBSLinuxNode1_Cert.cer

# On Node 2

scp -r root@TBSLinuxNode2:/var/opt/mssql/data/TBSLinuxNode2_Cert.cer 

root@TBSLinuxNode1:/var/opt/mssql/data/TBSLinuxNode2_Cert.cer

# Change Ownership of certificate to mssql on each node(In my case I have only two nodes)

sudo chown mssql:mssql TBSLinuxNode2_Cert.cer
sudo chown mssql:mssql TBSLinuxNode1_Cert.cer

# Create instance Level SQL User (TBSAGUser in my case on each node) using SSMS
Open SSMS and create User
# Restore certificate of Other Nodes into the present node using SSMS below: Login to TBSLinuxNode1

CREATE CERTIFICATE TBSLinuxNode2_Cert
AUTHORIZATION TBSAGUser
FROM FILE = '/var/opt/mssql/data/TBSLinuxNode2_Cert.cer';

# Grant permission to connec to the endpoint of TBSLinuxNode1

GRANT CONNECT ON ENDPOINT::TBSSQLAG TO TBSAGUser;

# Let's do the same thing by connecting to TBSLinuxNode2 and restore TBSLinuxNode1.cert

CREATE CERTIFICATE TBSLinuxNode1_Cert
AUTHORIZATION TBSAGUser
FROM FILE = '/var/opt/mssql/data/TBSLinuxNode1_Cert.cer';

# Grant permission to connec to the endpoint of TBSLinuxNode2

GRANT CONNECT ON ENDPOINT::TBSSQLAG TO TBSAGUser;

# Create Availability Group using SSMS with Cluster type External

# Create a new login or use the same login to give Pacemaker permission and provide view server permission, I will give 

#sysadmin to this user just for this demo

# On all Nodes Edit vi /var/opt/mssql/secrets/passwd using emacs and update with user and password that you created for 

Pacemaker and save it

TBSAGUser
Pass@123
# Hold down the CTRL key and then press X, then C, to exit and save the file
# setup right permission

sudo chmod 400 /var/opt/mssql/secrets/passwd

# Create the AG resource in the Pacemaker cluster

sudo pcs resource create TBSLinuxRG ocf:mssql:ag ag_name=TBSLinuxAG meta failure-timeout=30s --master meta notify=true

# Create IP resource for Listener 
sudo pcs resource create LinuxSQLProdList ocf:heartbeat:IPaddr2 ip=192.168.1.104 cidr_netmask=24

# Create an ordering constraint to ensure that the AG resource is up and running before the IP address. While the colocation 

#constraint implies an ordering constraint, this enforces it

sudo pcs constraint order promote TBSLinuxRG-master then start LinuxSQLProdList

# Let's Test Failover

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