Configuring OpenResty Edge Database High Availability with Interactive Scripts
1. Preamble
If you want to manually configure OpenResty Edge database high availability, please see the documentation: OpenResty Edge Database High Availability
This document demonstrates the use of interactive scripts to configure the OpenResty Edge database for high availability.
2. Configure the Master Server
SSH to the Master machine
Download the configuration script
curl -O https://openresty.com/client/oredge/openresty-edge-db-ha-master.sh
- Run the configuration script
sudo bash openresty-edge-db-ha-master.sh
The interaction process is as follows:
[+] Please enter the standby host(like 192.168.0.2): 192.168.122.1
[+] Info: ping 192.168.122.1 succeeded.
[+] Please enter PG data path of master(default '/var/postgres12/data'):
[+] Please enter a username for replication, will create if it doesn't exist (default 'replicator'):
[+] Please enter a password for the user replicator (default [Randomly generate]):
[+] Will restart PG, do you want to continue? [y/N] y
[+] Restarting the openresty-postgresql12 service
[!] Saving Master info to ./postgresql-master.info.20220511025907
------------------------------------
STANDBY_HOST="192.168.122.1"
MASTER_HOST="127.0.0.1"
MASTER_PORT=5432"
USERNAME="replicator"
PASSWORD="TcVch76UzWaUyMJ5-5sWI9mZW3M5zBiv"
PG_DATA_PATH="/var/postgres12/data"
PG_DATA_SIZE="2.8G"
------------------------------------
[+] Info: master setup successfully.
standby host: The address of Standby, such as 192.168.0.2, used to configure access control.
master port: The service port of Master, e.g. 5432.
username: user for replication, e.g. replicator, or create if it does not exist.
password: password of the user to be used for replication, e.g. examplepwd, if the user already exists, the password should be obtained by yourself.
3. Configure the Standby Server
SSH to Standby machine
Download the configuration script
curl -O https://openresty.com/client/oredge/openresty-edge-db-ha-standby.sh
- Run the configuration script
sudo bash openresty-edge-db-ha-standby.sh
The interaction process is as follows:
[+] Please make sure you have enough free hard disk space, do you want to continue? [y/N] y
[+] Please enter PG data path of standby(default '/var/postgres12/data'): /mnt/data/test/postgres12/data
[+] Please enter the standby port(default 5432): 5436
[+] Please enter the master host(like 192.168.0.1): 192.168.122.37
[+] Info: ping 192.168.122.37 succeeded.
[+] Please enter the master port(default 5432):
[+] Please enter a username for replication(same as master, default 'replicator'):
[+] Please enter the password of user replicator: TcVch76UzWaUyMJ5-5sWI9mZW3M5zBiv
[+] Info: syncing master data, it may take a long time, please wait patiently
[+] Info: wait for the standby server to start
[+] Info: standby setup successfully.
master host: Master’s service address, such as 192.168.0.1
master port: the service port of Master, such as 5432.
username: the user for backup (the same as the one configured in Master), e.g. replicator.
password: password of the user to be backed up (same as the one configured in Master), e.g. examplepwd
4. Verification
Execute on the Master Server
/usr/local/openresty-postgresql12/bin/psql -x -c "select * from pg_stat_replication" -U postgres
An execution result similar to the following indicates a successful configuration
-[ RECORD 1 ]----+------------------------------
pid | 29015
usesysid | 22228
usename | replicator
application_name | walreceiver
client_addr | 192.168.122.1
client_hostname |
client_port | 38440
backend_start | 2022-02-21 23:36:46.418257-08
backend_xmin | 5222925
state | streaming
sent_lsn | 2/C5151CE8
write_lsn | 2/C5151CE8
flush_lsn | 2/C5151CE8
replay_lsn | 2/C5151CE8
write_lag | 00:00:00.000435
flush_lag | 00:00:00.001187
replay_lag | 00:00:00.001394
sync_priority | 0
sync_state | async
reply_time | 2022-02-21 23:42:21.456685-08