# 练习-1: 对 TiDB 集群进行扩容和缩容 ## 练习目的 在本次练习中，我们对现有的 TiDB 数据库集群进行扩容操作（加入一个 TiKV 节点），之后进行缩容操作（减少一个 TiKV 节点）。 ## 前提条件 + 注意，您的实验环境（包括 IP，端口号，用户名，密码和目录）可能和手册不同。 + 可以连接到实验用虚拟机。 + TiDB 数据库之前部署完毕。 ## 步骤 ----------------------------------------------- #### 1. 查询现有的数据库集群，查看 TiKV 节点数量： ``` $ tiup cluster display tidb-test ``` ----------------------------------------------- #### 2. 编辑扩容文件 ``` $ vi scale-out-tikv.yaml ``` + 添加以下内容，其中，加入 TiKV 节点 IP 地址为：172.31.0.250，端口号：20160。注意：您的环境可能和实验手册不同。 ``` tikv_servers: - host: 172.31.0.250 ssh_port: 22 port: 20160 status_port: 20180 deploy_dir: /tidb-deploy/tikv-20160 data_dir: /tidb-data/tikv-20160 log_dir: /tidb-deploy/tikv-20160/log ``` ----------------------------------------------- #### 3. 执行以下命令，进行扩容操作: ``` $ tiup cluster scale-out tidb-test scale-out-tikv.yaml -uroot -p ``` ----------------------------------------------- #### 4. 查看集群状态，发现新的 TiKV 节点已经加入: ``` $ tiup cluster display tidb-test ``` ----------------------------------------------- #### 5. 扩容成功后，我们进行缩容操作 ``` $ tiup cluster scale-in tidb-test --node 172.31.0.250:20160 ``` ----------------------------------------------- #### 6. 查询所容后的集群状态，发现执行缩容的节点 Status 已经变为 Tombstone，代表节点已经下线： ``` $ tiup cluster display tidb-test ``` ----------------------------------------------- #### 7. 执行 tiup cluster prune tidb-test , 清理节点信息： ``` $ tiup cluster prune tidb-test ``` ----------------------------------------------- #### 8. 查询集群状态，发现之前扩容的节点已经消失： ``` $ tiup cluster display tidb-test ``` ----------------------------------------------- ## 输出样例 ----------------------------------------------- #### 步骤 1 输出参考 ``` $ tiup cluster display tidb-test tiup is checking updates for component cluster ... Starting component `cluster`: /root/.tiup/components/cluster/v1.10.1/tiup-cluster display tidb-test Cluster type: tidb Cluster name: tidb-test Cluster version: v6.1.0 Deploy user: tidb SSH type: builtin Dashboard URL: http://172.31.0.112:2379/dashboard Grafana URL: http://172.31.0.250:3000 ID Role Host Ports OS/Arch Status Data Dir Deploy Dir -- ---- ---- ----- ------- ------ -------- ---------- 172.31.0.250:9093 alertmanager 172.31.0.250 9093/9094 linux/x86_64 Up /tidb-data/alertmanager-9093 /tidb-deploy/alertmanager-9093 172.31.0.250:3000 grafana 172.31.0.250 3000 linux/x86_64 Up - /tidb-deploy/grafana-3000 172.31.0.112:2379 pd 172.31.0.112 2379/2380 linux/x86_64 Up|UI /tidb-data/pd-2379 /tidb-deploy/pd-2379 172.31.0.250:2379 pd 172.31.0.250 2379/2380 linux/x86_64 Up|L /tidb-data/pd-2379 /tidb-deploy/pd-2379 172.31.0.253:2379 pd 172.31.0.253 2379/2380 linux/x86_64 Up /tidb-data/pd-2379 /tidb-deploy/pd-2379 172.31.0.250:9090 prometheus 172.31.0.250 9090/12020 linux/x86_64 Up /tidb-data/prometheus-9090 /tidb-deploy/prometheus-9090 172.31.0.106:4000 tidb 172.31.0.106 4000/10080 linux/x86_64 Up - /tidb-deploy/tidb-4000 172.31.0.45:9000 tiflash 172.31.0.45 9000/8123/3930/20170/20292/8234 linux/x86_64 Up /tidb-data/tiflash-9000 /tidb-deploy/tiflash-9000 172.31.0.215:20160 tikv 172.31.0.215 20160/20180 linux/x86_64 Up /tidb-data/tikv-20160 /tidb-deploy/tikv-20160 172.31.0.34:20160 tikv 172.31.0.34 20160/20180 linux/x86_64 Up /tidb-data/tikv-20160 /tidb-deploy/tikv-20160 172.31.0.85:20160 tikv 172.31.0.85 20160/20180 linux/x86_64 Up /tidb-data/tikv-20160 /tidb-deploy/tikv-20160 Total nodes: 11 ``` ----------------------------------------------- #### 步骤 4 输出参考 ``` $ tiup cluster display tidb-test tiup is checking updates for component cluster ... Starting component `cluster`: /root/.tiup/components/cluster/v1.10.2/tiup-cluster display tidb-test Cluster type: tidb Cluster name: tidb-test Cluster version: v6.1.0 Deploy user: tidb SSH type: builtin Dashboard URL: http://172.31.0.112:2379/dashboard Grafana URL: http://172.31.0.250:3000 ID Role Host Ports OS/Arch Status Data Dir Deploy Dir -- ---- ---- ----- ------- ------ -------- ---------- 172.31.0.250:9093 alertmanager 172.31.0.250 9093/9094 linux/x86_64 Up /tidb-data/alertmanager-9093 /tidb-deploy/alertmanager-9093 172.31.0.250:3000 grafana 172.31.0.250 3000 linux/x86_64 Up - /tidb-deploy/grafana-3000 172.31.0.112:2379 pd 172.31.0.112 2379/2380 linux/x86_64 Up|UI /tidb-data/pd-2379 /tidb-deploy/pd-2379 172.31.0.250:2379 pd 172.31.0.250 2379/2380 linux/x86_64 Up|L /tidb-data/pd-2379 /tidb-deploy/pd-2379 172.31.0.253:2379 pd 172.31.0.253 2379/2380 linux/x86_64 Up /tidb-data/pd-2379 /tidb-deploy/pd-2379 172.31.0.250:9090 prometheus 172.31.0.250 9090/12020 linux/x86_64 Up /tidb-data/prometheus-9090 /tidb-deploy/prometheus-9090 172.31.0.106:4000 tidb 172.31.0.106 4000/10080 linux/x86_64 Up - /tidb-deploy/tidb-4000 172.31.0.45:9000 tiflash 172.31.0.45 9000/8123/3930/20170/20292/8234 linux/x86_64 Up /tidb-data/tiflash-9000 /tidb-deploy/tiflash-9000 172.31.0.215:20160 tikv 172.31.0.215 20160/20180 linux/x86_64 Up /tidb-data/tikv-20160 /tidb-deploy/tikv-20160 172.31.0.250:20160 tikv 172.31.0.250 20160/20180 linux/x86_64 Up /data/deploy/install/data/tikv-20160 /data/deploy/install/deploy/tikv-20160 172.31.0.34:20160 tikv 172.31.0.34 20160/20180 linux/x86_64 Up /tidb-data/tikv-20160 /tidb-deploy/tikv-20160 172.31.0.85:20160 tikv 172.31.0.85 20160/20180 linux/x86_64 Up /tidb-data/tikv-20160 /tidb-deploy/tikv-20160 Total nodes: 12 ``` ----------------------------------------------- #### 步骤 6 输出参考 ``` $ tiup cluster display tidb-test tiup is checking updates for component cluster ... Starting component `cluster`: /root/.tiup/components/cluster/v1.10.2/tiup-cluster display tidb-test Cluster type: tidb Cluster name: tidb-test Cluster version: v6.1.0 Deploy user: tidb SSH type: builtin Dashboard URL: http://172.31.0.112:2379/dashboard Grafana URL: http://172.31.0.250:3000 ID Role Host Ports OS/Arch Status Data Dir Deploy Dir -- ---- ---- ----- ------- ------ -------- ---------- 172.31.0.250:9093 alertmanager 172.31.0.250 9093/9094 linux/x86_64 Up /tidb-data/alertmanager-9093 /tidb-deploy/alertmanager-9093 172.31.0.250:3000 grafana 172.31.0.250 3000 linux/x86_64 Up - /tidb-deploy/grafana-3000 172.31.0.112:2379 pd 172.31.0.112 2379/2380 linux/x86_64 Up|UI /tidb-data/pd-2379 /tidb-deploy/pd-2379 172.31.0.250:2379 pd 172.31.0.250 2379/2380 linux/x86_64 Up|L /tidb-data/pd-2379 /tidb-deploy/pd-2379 172.31.0.253:2379 pd 172.31.0.253 2379/2380 linux/x86_64 Up /tidb-data/pd-2379 /tidb-deploy/pd-2379 172.31.0.250:9090 prometheus 172.31.0.250 9090/12020 linux/x86_64 Up /tidb-data/prometheus-9090 /tidb-deploy/prometheus-9090 172.31.0.106:4000 tidb 172.31.0.106 4000/10080 linux/x86_64 Up - /tidb-deploy/tidb-4000 172.31.0.45:9000 tiflash 172.31.0.45 9000/8123/3930/20170/20292/8234 linux/x86_64 Up /tidb-data/tiflash-9000 /tidb-deploy/tiflash-9000 172.31.0.215:20160 tikv 172.31.0.215 20160/20180 linux/x86_64 Up /tidb-data/tikv-20160 /tidb-deploy/tikv-20160 172.31.0.250:20160 tikv 172.31.0.250 20160/20180 linux/x86_64 Tombstone /data/deploy/install/data/tikv-20160 /data/deploy/install/deploy/tikv-20160 172.31.0.34:20160 tikv 172.31.0.34 20160/20180 linux/x86_64 Up /tidb-data/tikv-20160 /tidb-deploy/tikv-20160 172.31.0.85:20160 tikv 172.31.0.85 20160/20180 linux/x86_64 Up /tidb-data/tikv-20160 /tidb-deploy/tikv-20160 Total nodes: 12 ``` ----------------------------------------------- #### 步骤 8 输出参考 ``` $ tiup cluster display tidb-test tiup is checking updates for component cluster ... Starting component `cluster`: /root/.tiup/components/cluster/v1.10.2/tiup-cluster display tidb-test Cluster type: tidb Cluster name: tidb-test Cluster version: v6.1.0 Deploy user: tidb SSH type: builtin Dashboard URL: http://172.31.0.112:2379/dashboard Grafana URL: http://172.31.0.250:3000 ID Role Host Ports OS/Arch Status Data Dir Deploy Dir -- ---- ---- ----- ------- ------ -------- ---------- 172.31.0.250:9093 alertmanager 172.31.0.250 9093/9094 linux/x86_64 Up /tidb-data/alertmanager-9093 /tidb-deploy/alertmanager-9093 172.31.0.250:3000 grafana 172.31.0.250 3000 linux/x86_64 Up - /tidb-deploy/grafana-3000 172.31.0.112:2379 pd 172.31.0.112 2379/2380 linux/x86_64 Up|UI /tidb-data/pd-2379 /tidb-deploy/pd-2379 172.31.0.250:2379 pd 172.31.0.250 2379/2380 linux/x86_64 Up|L /tidb-data/pd-2379 /tidb-deploy/pd-2379 172.31.0.253:2379 pd 172.31.0.253 2379/2380 linux/x86_64 Up /tidb-data/pd-2379 /tidb-deploy/pd-2379 172.31.0.250:9090 prometheus 172.31.0.250 9090/12020 linux/x86_64 Up /tidb-data/prometheus-9090 /tidb-deploy/prometheus-9090 172.31.0.106:4000 tidb 172.31.0.106 4000/10080 linux/x86_64 Up - /tidb-deploy/tidb-4000 172.31.0.45:9000 tiflash 172.31.0.45 9000/8123/3930/20170/20292/8234 linux/x86_64 Up /tidb-data/tiflash-9000 /tidb-deploy/tiflash-9000 172.31.0.215:20160 tikv 172.31.0.215 20160/20180 linux/x86_64 Up /tidb-data/tikv-20160 /tidb-deploy/tikv-20160 172.31.0.34:20160 tikv 172.31.0.34 20160/20180 linux/x86_64 Up /tidb-data/tikv-20160 /tidb-deploy/tikv-20160 172.31.0.85:20160 tikv 172.31.0.85 20160/20180 linux/x86_64 Up /tidb-data/tikv-20160 /tidb-deploy/tikv-20160 Total nodes: 11 ```