1 安装及编译

yum install -y centos-release-scl-rh epel-release

yum update -y
yum groupinstall -y 'Development Tools'

yum install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm

yum install -y postgresql14-devel postgresql14-server postgresql14-contrib   \
                      git libcurl-devel libxml2-devel libxslt-devel \
                      libzstd-devel llvm-toolset-7-clang llvm5.0 lz4-devel \
                      openssl-devel pam-devel readline-devel

                      
git clone https://github.com/citusdata/citus.git
cd citus
PG_CONFIG=/usr/pgsql-14/bin/pg_config ./configure
make
make install
                      
2 所有节点：postgresql配置修改

pg_hba.conf
# Allow unrestricted access to nodes in the local network. The following ranges
# correspond to 24, 20, and 16-bit blocks in Private IPv4 address spaces.
host    all             all             192.168.56.0/24              trust

postgresql.conf:
# Uncomment listen_addresses for the changes to take effect
listen_addresses = '*'
shared_preload_libraries = 'citus'

3 重启postgresql:
pg_ctl restart

4 所有节点：创建扩展citus
psql:

CREATE EXTENSION citus;
5 对应的节点上，修改hosts文件
  vi /etc/hosts:
   
  192.168.56.90 cn1
  192.168.56.91 wn1
  192.168.56.92 wn2
  
6 配置 coordinator node
  
 # Register the hostname that future workers will use to connect
# to the coordinator node.
#
# You'll need to change the example, 'coord.example.com',
# to match the actual hostname

psql:

SELECT citus_set_coordinator_host('cn1', 5432);

# Add the worker nodes.
#
# Similarly, you'll need to change 'worker-101' and 'worker-102' to the
# actual hostnames

SELECT * from citus_add_node('wn1', 5432);
SELECT * from citus_add_node('wn2', 5432);

-- rebalance the shards over the new worker nodes
SELECT rebalance_table_shards();

Verify that installation has succeeded:

SELECT * FROM citus_get_active_worker_nodes();