# Add Citus repository for package manager
curl https://install.citusdata.com/community/rpm.sh | sudo bash

# install PostgreSQL with Citus extension
sudo yum install -y citus72_10
# initialize system database (using RHEL 6 vs 7 method as necessary)
sudo service postgresql-10 initdb || sudo /usr/pgsql-10/bin/postgresql-10-setup initdb
# preload citus extension
echo "shared_preload_libraries = 'citus'" | sudo tee -a /var/lib/pgsql/10/data/postgresql.conf

sudo vi /var/lib/pgsql/10/data/postgresql.conf

# Uncomment listen_addresses for the changes to take effect
listen_addresses = '*'

sudo vi /var/lib/pgsql/10/data/pg_hba.conf

local  all       all                     peer   
local  replication   all                     peer
host  all       all       192.168.99.1/24       trust
host  all       all       0.0.0.0/0          md5

firewall-cmd --zone=public --query-port=5432/tcp

firewall-cmd --zone=public --add-port=5432/tcp --permanent

firewall-cmd --reload

# start the db server
sudo service postgresql-10 restart
# and make it start automatically when computer does
sudo chkconfig postgresql-10 on

sudo -i -u postgres psql -c "CREATE EXTENSION citus;"

postgres=# \password postgres     #给postgres用户设置密码
Enter new password: 
Enter it again: 

sudo -i -u postgres psql -c "SELECT * from master_add_node('192.168.99.101', 5432);"
sudo -i -u postgres psql -c "SELECT * from master_add_node('192.168.99.102', 5432);"

sudo -i -u postgres psql -c "SELECT * FROM master_get_active_worker_nodes();"

sudo -i -u postgres psql