CockroachDB 三节点集群搭建

运行环境： CentOS7.4+ CockroachDB 2.0.5

规划：
 节点序列  节点IP  数据目录
node1   10.19.189.221  node1
node2   10.19.85.149   node2
node3   10.19.15.103   node3

在三个节点上分别下载安装文件：
# wget https://binaries.cockroachdb.com/cockroach-v2.0.5.linux-amd64.tgz
解压文件：
#tar -xzf cockroach-v2.0.5.linux-amd64.tgz -C /data
#mv /data/cockroach-v2.0.5.linux-amd64  /data/cockroach

启动第一个节点：
#/data/cockroach/cockroach --insecure --host=10.19.189.221 &
* WARNING: RUNNING IN INSECURE MODE!
* 
* - Your cluster is open for any client that can access 10.19.189.221.
* - 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/v2.0/secure-a-cluster.html
*
CockroachDB node starting at 2018-08-27 14:31:24.768760887 +0000 UTC (took 0.7s)
build:               CCL v2.0.5 @ 2018/08/13 17:59:42 (go1.10)
admin:               http://10.19.189.221:8080
sql:                 postgresql://[email protected]:26257?sslmode=disable
logs:                /data/cockroach/cockroach-data/logs
temp dir:            /data/cockroach/cockroach-data/cockroach-temp559488938
external I/O path:   /data/cockroach/cockroach-data/extern
store[0]:            path=/data/cockroach/cockroach-data
status:              restarted pre-existing node
clusterID:           4f18c743-fb6c-48eb-9fcc-5a598dd51b2f
nodeID:              1

启动第二个节点：
#/data/cockroach/cockroach  --insecure --store=node2 --host=10.19.85.149 --port=26257 --http-port=8080 --join=10.19.189.221:26257 &

启动第三个节点：
#/data/cockroach/cockroach  --insecure --store=node3 --host=10.19.15.103 --port=26257 --http-port=8080 --join=10.19.189.221:26257 &

启动的提示信息中status有如下三种可能的提示信息：
1.
2.
3.
--查询集群的状态信息：
# ./cockroach node status --insecure --host=10.19.85.149
+----+---------------------+--------+---------------------+---------------------+---------+
| id |       address       | build  |     updated_at      |     started_at      | is_live |
+----+---------------------+--------+---------------------+---------------------+---------+
|  1 | 10.19.189.221:26257 | v2.0.5 | 2018-08-27 16:05:14 | 2018-08-27 14:31:24 | true    |
|  2 | 10.19.85.149:26257  | v2.0.5 | 2018-08-27 16:05:13 | 2018-08-27 14:37:03 | true    |
|  3 | 10.19.15.103:26257  | v2.0.5 | 2018-08-27 16:05:14 | 2018-08-27 14:38:54 | true    |
+----+---------------------+--------+---------------------+---------------------+---------+
(3 rows)

--查询集群的ID信息：
# ./cockroach node ls --insecure --host=10.19.85.149
+----+
| id |
+----+
|  1 |
|  2 |
|  3 |
+----+
(3 rows)
--查询某个节点的信息：
 ./cockroach node status 1 --insecure --host=10.19.85.149
+----+---------------------+--------+---------------------+---------------------+---------+
| id |       address       | build  |     updated_at      |     started_at      | is_live |
+----+---------------------+--------+---------------------+---------------------+---------+
|  1 | 10.19.189.221:26257 | v2.0.5 | 2018-08-27 16:06:44 | 2018-08-27 14:31:24 | true    |
+----+---------------------+--------+---------------------+---------------------+---------+
(1 row)

--cockroachDB的版本信息查询：
# ./cockroach version
Build Tag:    v2.0.5
Build Time:   2018/08/13 17:59:42
Distribution: CCL
Platform:     linux amd64 (x86_64-unknown-linux-gnu)
Go Version:   go1.10
C Compiler:   gcc 6.3.0
Build SHA-1:  3f2f0f5eea9b9d552e471eba8c37504a0595342f
Build Type:   release


--集群验证：
登录第一个节点：
./cockroach sql --insecure --host=10.19.189.221
[email protected]:26257/> create database wuhan;
[email protected]:26257/> show databases;
+----------+
| Database |
+----------+
| system   |
| wuhan    |
+----------+
(2 rows)

Time: 1.638805ms

[email protected]:26257/wuhan> create table wuhan.city(id int not null  primary key,cityname varchar(20));
CREATE TABLE

Time: 12.52473ms

[email protected]:26257/wuhan> insert into wuhan.city(id,cityname)values(1,'wuhan');
INSERT 1

Time: 10.27255ms

[email protected]:26257/wuhan> select * from wuhan.city;
+----+----------+
| id | cityname |
+----+----------+
|  1 | wuhan    |
+----+----------+
(1 row)

Time: 2.52213ms

登录第二个节点和第三个节点查询：
[email protected]:26257/> select * from wuhan.city;
+----+----------+
| id | cityname |
+----+----------+
|  1 | wuhan    |
+----+----------+
(1 row)

Time: 71.180567ms
[email protected]:26257/> select * from wuhan.city;
+----+----------+
| id | cityname |
+----+----------+
|  1 | wuhan    |
+----+----------+
(1 row)

Time: 12.772636ms

--退出：
[email protected]:26257/>\q

说明：

--store=指定了存储的目录，不指定默认为当前目录下的cockroach-data；
--port= 指定了cockroachdb运行的端口号，默认是26257.
集群的监控可以登录任意一个节点，通过默认的8080端口进行监控，示例如下：
CockroachDB 三节点集群搭建

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