cockroachdb 替换mysql_cockroachdb 安装试用（单机伪分布式）

1. 下载

以下地址，选择对应的操作系统版本即可

https://www.cockroachlabs.com/docs/stable/install-cockroachdb.html

2. 启动

// 启动命令

cockroach start --insecure

--host=xxxxx

// 提示信息

*

* WARNING: RUNNING IN INSECURE MODE!

*

* - Your cluster is open for any client that can access xxxxxxx.

* - Any user, even root, can log in without providing a password.

* - Any user, connecting as root, can read or write any data in your cluster.

* - There is no network encryption nor authentication, and thus no confidentiality.

*

* Check out how to secure your cluster: https://www.cockroachlabs.com/docs/stable/secure-a-cluster.html

*

CockroachDB node starting at 2017-11-15 13:21:34.967650407 +0000 UTC (took 0.7s)

build: CCL v1.1.2 @ 2017/11/02 19:32:03 (go1.8.3)

admin: http://xxxxxxx:8080

sql: postgresql://root@xxxxxxxx:26257?application_name=cockroach&sslmode=disable

logs: /opt/cockroachdb/cockroach-data/logs

store[0]: path=/opt/cockroachdb/cockroach-data

status: restarted pre-existing node

clusterID: cb2be836-d9d6-4e39-826d-672490fae71d

nodeID: 1

3. 添加另一台节点

cockroach start

--insecure

--store=node2

--host=xxxxx

--port=26258

--http-port=8081

--join=xxxxxx:26257

输出信息

*

* WARNING: RUNNING IN INSECURE MODE!

*

* - Your cluster is open for any client that can access xxxxx.

* - Any user, even root, can log in without providing a password.

* - Any user, connecting as root, can read or write any data in your cluster.

* - There is no network encryption nor authentication, and thus no confidentiality.

*

* Check out how to secure your cluster: https://www.cockroachlabs.com/docs/stable/secure-a-cluster.html

*

CockroachDB node starting at 2017-11-15 13:33:36.310186654 +0000 UTC (took 0.2s)

build: CCL v1.1.2 @ 2017/11/02 19:32:03 (go1.8.3)

admin: http://xxxxxxxx:8081

sql: postgresql://root@xxxxxxxxxxx:26258?application_name=cockroach&sslmode=disable

logs: /opt/cockroachdb/node2/logs

store[0]: path=/opt/cockroachdb/node2

status: initialized new node, joined pre-existing cluster

clusterID: cb2be836-d9d6-4e39-826d-672490fae71d

nodeID: 2

4. 添加第三个节点

操作类似

cockroach start

--insecure

--store=node3

--host=xxxxxx

--port=26259

--http-port=8082

--join=xxxxx:26257

5. 可视化操作界面

集群管理界面

数据库界面

连接界面

6. 数据库连接操作

参考上图：

// 非安全模式连接

cockroach sql --host=xxxxx --insecure

// 创建数据库

create database bank

// 创建表

CREATE TABLE bank.accounts (id INT PRIMARY KEY, balance DECIMAL);

// 插入数据

INSERT INTO bank.accounts VALUES (1, 1000.50);

// 查询

SELECT * FROM bank.accounts;

+----+---------+

| id | balance |

+----+---------+

| 1 | 1000.50 |

+----+---------+

(1 row)

Time: 1.074601ms

7. 总结

使用起来还是比较简单的，部署也简单，原有代码基本不需要改动就可以使用

目前百度已经有大规模的使用了，同时有百度牵头的首届社区大会前段时间也已经举行了

分布式，多云环境支持，可以将用户的查询定位到离用户最近的位置，功能很强大

8. 参考文档

https://www.cockroachlabs.com/docs/stable/start-a-local-cluster.html

https://www.cockroachlabs.com/docs/stable/install-cockroachdb.html