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db postgres citus 10

Citus transforms Postgres into a distributed database, to give your application high performance—at any scale.

分布式PostgreSQL数据库CitusDB CitusDB采用PostgreSQL的插件形式(not a fork),即享受PostgreSQL的强大支持,又同时拥有分布式数据库能力。

​​citus real-time 分析demo( 来自官方文档)​​

citus 对于多租户以及实时应用的开发都是比较好的,官方也提供了demo

参考项目 ​​https://github.com/rongfengliang/citus-hasuar-graphql​​

在CentOS中部署多节点Citus集群的详细步骤

https://www.jb51.net/article/135450.htm

1 在所有节点执行以下步骤

Step 01 添加Citus Repostory

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

Step 02 安装Citus并且初始化DB

# 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      

Step 03 配置postgresql.conf

sudo vi /var/lib/pgsql/10/data/postgresql.conf      
# Uncomment listen_addresses for the changes to take effect
listen_addresses = '*'      

Step 04 配置pg_hba.conf

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      

Step 05 配置防火墙

  查看

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

  添加5432端口(--permanent永久生效,没有此参数重启后失效)

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

  重新载入

firewall-cmd --reload      

Step 06 启动服务

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

Step 07 给需要的数据库安装Citus扩展

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

Step 08 设置密码

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

2 在coordinator节点额外执行以下步骤

Step 01 添加worker节点信息

  添加worker节点的IP地址(或者DNS名称)和端口号到pg_dist_node表。

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);"      

Step 02 验证安装是否成功

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

Step 03 开始使用

sudo -i -u postgres psql      

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