tiup playground只启动一个实例的时候用的是4000，启动第二个实例的时候端口号似乎就不是固定的了，要如何指定？help里也没有提到端口号。
Examples:
$ tiup playground nightly # Start a TiDB nightly version local cluster
$ tiup playground v5.0.1 --db 3 --pd 3 --kv 3 # Start a local cluster with 10 nodes
$ tiup playground nightly --monitor=false # Start a local cluster and disable monitor system
$ tiup playground --pd.config ~/config/pd.toml # Start a local cluster with specified configuration file
$ tiup playground --db.binpath /xx/tidb-server # Start a local cluster with component binary path
$ tiup playground --mode tikv-slim # Start a local tikv only cluster (No TiDB or TiFlash Available)
$ tiup playground --mode tikv-slim --kv 3 --pd 3 # Start a local tikv only cluster with 6 nodes
Usage:
tiup playground [version] [flags]
tiup [command]
Available Commands:
display
help Help about any command
scale-in
scale-out
Flags:
--db int TiDB instance number
--db.Host host Playground TiDB host. If not provided, TiDB will still use host flag as its host
--db.binpath string TiDB instance binary path
--db.config string TiDB instance configuration file
--db.timeout int TiDB max wait time in seconds for starting, 0 means no limit
--drainer int Drainer instance number
--drainer.binpath string Drainer instance binary path
--drainer.config string Drainer instance configuration file
-h, --help help for tiup
--host string Playground cluster host
--kv int TiKV instance number
--kv.binpath string TiKV instance binary path
--kv.config string TiKV instance configuration file
--mode string TiUP playground mode: 'tidb', 'tikv-slim' (default "tidb")
--monitor Start prometheus and grafana component
--pd int PD instance number
--pd.Host host Playground PD host. If not provided, PD will still use host flag as its host
--pd.binpath string PD instance binary path
--pd.config string PD instance configuration file
--pump int Pump instance number
--pump.binpath string Pump instance binary path
--pump.config string Pump instance configuration file
--ticdc int TiCDC instance number
--ticdc.binpath string TiCDC instance binary path
--ticdc.config string TiCDC instance configuration file
--tiflash int TiFlash instance number
--tiflash.binpath string TiFlash instance binary path
--tiflash.config string TiFlash instance configuration file
--tiflash.timeout int TiFlash max wait time in seconds for starting, 0 means no limit
-v, --version version for tiup
