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docs(docker): update docker document (#16253) 

* docs(docker): update docker document

* docs(docker): update docker document
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Xuefeng Tan 2022-08-19 18:08:05 +08:00 committed by GitHub
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@ -25,10 +25,11 @@ curl -u root:taosdata -d "show databases" localhost:6041/rest/sql
$ docker exec -it tdengine taos $ docker exec -it tdengine taos
taos> show databases; taos> show databases;
name | created_time | ntables | vgroups | replica | quorum | days | keep | cache(MB) | blocks | minrows | maxrows | wallevel | fsync | comp | cachelast | precision | update | status | name |
==================================================================================================================================================================================================================================================================================== =================================
log | 2022-01-17 13:57:22.270 | 10 | 1 | 1 | 1 | 10 | 30 | 1 | 3 | 100 | 4096 | 1 | 3000 | 2 | 0 | us | 0 | ready | information_schema |
Query OK, 1 row(s) in set (0.002843s) performance_schema |
Query OK, 2 rows in database (0.033802s)
``` ```
因为运行在容器中的 TDengine 服务端使用容器的 hostname 建立连接，使用 taos shell 或者各种连接器（例如 JDBC-JNI）从容器外访问容器内的 TDengine 比较复杂，所以上述方式是访问容器中 TDengine 服务的最简单的方法，适用于一些简单场景。如果在一些复杂场景下想要从容器化使用 taos shell 或者各种连接器访问容器中的 TDengine 服务，请参考下一节。 因为运行在容器中的 TDengine 服务端使用容器的 hostname 建立连接，使用 taos shell 或者各种连接器（例如 JDBC-JNI）从容器外访问容器内的 TDengine 比较复杂，所以上述方式是访问容器中 TDengine 服务的最简单的方法，适用于一些简单场景。如果在一些复杂场景下想要从容器化使用 taos shell 或者各种连接器访问容器中的 TDengine 服务，请参考下一节。
@ -45,10 +46,11 @@ docker run -d --name tdengine --network host tdengine/tdengine
$ taos $ taos
taos> show dnodes; taos> show dnodes;
id | end_point | vnodes | cores | status | role | create_time | offline reason | id | endpoint | vnodes | support_vnodes | status | create_time | note |
====================================================================================================================================== =================================================================================================================================================
1 | myhost:6030 | 1 | 8 | ready | any | 2022-01-17 22:10:32.619 | | 1 | vm98:6030 | 0 | 32 | ready | 2022-08-19 14:50:05.337 | |
Query OK, 1 row(s) in set (0.003233s) Query OK, 1 rows in database (0.010654s)
``` ```
## 以指定的 hostname 和 port 启动 TDengine ## 以指定的 hostname 和 port 启动 TDengine
@ -59,12 +61,13 @@ Query OK, 1 row(s) in set (0.003233s)
docker run -d \ docker run -d \
--name tdengine \ --name tdengine \
-e TAOS_FQDN=tdengine \ -e TAOS_FQDN=tdengine \
-p 6030-6049:6030-6049 \ -p 6030:6030 \
-p 6030-6049:6030-6049/udp \ -p 6041-6049:6041-6049 \
-p 6041-6049:6041-6049/udp \
tdengine/tdengine tdengine/tdengine
``` ```
上面的命令在容器中启动一个 TDengine 服务，其所监听的 hostname 为 tdengine ，并将容器的 6030 到 6049 端口段映射到主机的 6030 到 6049 端口段 （tcp 和 udp 都需要映射)。如果主机上该端口段已经被占用，可以修改上述命令指定一个主机上空闲的端口段。如果 `rpcForceTcp` 被设置为 `1` ，可以只映射 tcp 协议。 上面的命令在容器中启动一个 TDengine 服务，其所监听的 hostname 为 tdengine ，并将容器的 6030 端口映射到主机的 6030 端口（TCP，只能映射主机 6030 端口），6041-6049 端口段映射到主机 6041-6049 端口段（tcp 和 udp 都需要映射，如果主机上该端口段已经被占用，可以修改上述命令指定一个主机上空闲的端口段）。
接下来，要确保 "tdengine" 这个 hostname 在 `/etc/hosts` 中可解析。 接下来，要确保 "tdengine" 这个 hostname 在 `/etc/hosts` 中可解析。
@ -103,9 +106,9 @@ taos -h tdengine -P 6030
3. 在同一网络上的另一容器中启动 TDengine 客户端 3. 在同一网络上的另一容器中启动 TDengine 客户端
```shell ```shell
docker run --rm -it --network td-net -e TAOS_FIRST_EP=tdengine tdengine/tdengine taos docker run --rm -it --network td-net -e TAOS_FIRST_EP=tdengine --entrypoint=taos tdengine/tdengine
# or # or
#docker run --rm -it --network td-net -e tdengine/tdengine taos -h tdengine #docker run --rm -it --network td-net --entrypoint=taos tdengine/tdengine -h tdengine
``` ```
## 在容器中启动客户端应用 ## 在容器中启动客户端应用
@ -115,7 +118,7 @@ taos -h tdengine -P 6030
```docker ```docker
FROM ubuntu:20.04 FROM ubuntu:20.04
RUN apt-get update && apt-get install -y wget RUN apt-get update && apt-get install -y wget
ENV TDENGINE_VERSION=2.4.0.0 ENV TDENGINE_VERSION=3.0.0.0
RUN wget -c https://www.taosdata.com/assets-download/TDengine-client-${TDENGINE_VERSION}-Linux-x64.tar.gz \ RUN wget -c https://www.taosdata.com/assets-download/TDengine-client-${TDENGINE_VERSION}-Linux-x64.tar.gz \
&& tar xvf TDengine-client-${TDENGINE_VERSION}-Linux-x64.tar.gz \ && tar xvf TDengine-client-${TDENGINE_VERSION}-Linux-x64.tar.gz \
&& cd TDengine-client-${TDENGINE_VERSION} \ && cd TDengine-client-${TDENGINE_VERSION} \
@ -129,6 +132,14 @@ RUN wget -c https://www.taosdata.com/assets-download/TDengine-client-${TDENGINE_
以下是一个 go 应用程序的示例： 以下是一个 go 应用程序的示例：
* 创建 go mod 项目：
```bash
go mod init app
```
* 创建 main.go：
```go ```go
/* /*
* In this test program, we'll create a database and insert 4 records then select out. * In this test program, we'll create a database and insert 4 records then select out.
@ -212,12 +223,18 @@ func checkErr(err error, prompt string) {
} }
``` ```
如下是完整版本的 dockerfile * 更新 go mod
```docker ```bash
FROM golang:1.17.6-buster as builder go mod tidy
ENV TDENGINE_VERSION=2.4.0.0 ```
RUN wget -c https://www.taosdata.com/assets-download/TDengine-client-${TDENGINE_VERSION}-Linux-x64.tar.gz \
如下是完整版本的 dockerfile：
```dockerfile
FROM golang:1.19.0-buster as builder
ENV TDENGINE_VERSION=3.0.0.0
RUN wget -c https://www.taosdata.com/assets-download/3.0/TDengine-client-${TDENGINE_VERSION}-Linux-x64.tar.gz \
&& tar xvf TDengine-client-${TDENGINE_VERSION}-Linux-x64.tar.gz \ && tar xvf TDengine-client-${TDENGINE_VERSION}-Linux-x64.tar.gz \
&& cd TDengine-client-${TDENGINE_VERSION} \ && cd TDengine-client-${TDENGINE_VERSION} \
&& ./install_client.sh \ && ./install_client.sh \
@ -232,8 +249,8 @@ RUN go build
FROM ubuntu:20.04 FROM ubuntu:20.04
RUN apt-get update && apt-get install -y wget RUN apt-get update && apt-get install -y wget
ENV TDENGINE_VERSION=2.4.0.0 ENV TDENGINE_VERSION=3.0.0.0
RUN wget -c https://www.taosdata.com/assets-download/TDengine-client-${TDENGINE_VERSION}-Linux-x64.tar.gz \ RUN wget -c https://www.taosdata.com/assets-download/3.0/TDengine-client-${TDENGINE_VERSION}-Linux-x64.tar.gz \
&& tar xvf TDengine-client-${TDENGINE_VERSION}-Linux-x64.tar.gz \ && tar xvf TDengine-client-${TDENGINE_VERSION}-Linux-x64.tar.gz \
&& cd TDengine-client-${TDENGINE_VERSION} \ && cd TDengine-client-${TDENGINE_VERSION} \
&& ./install_client.sh \ && ./install_client.sh \
@ -248,113 +265,112 @@ CMD ["app"]
目前我们已经有了 `main.go`, `go.mod`, `go.sum`, `app.dockerfile`， 现在可以构建出这个应用程序并在 `td-net` 网络上启动它 目前我们已经有了 `main.go`, `go.mod`, `go.sum`, `app.dockerfile`， 现在可以构建出这个应用程序并在 `td-net` 网络上启动它
```shell ```shell
$ docker build -t app -f app.dockerfile $ docker build -t app -f app.dockerfile .
$ docker run --rm --network td-net app -h tdengine -p 6030 $ docker run --rm --network td-net app app -h tdengine -p 6030
============= args parse result: ============= ============= args parse result: =============
hostName: tdengine hostName: tdengine
serverPort: 6030 serverPort: 6030
usr: root usr: root
password: taosdata password: taosdata
================================================ ================================================
2022-01-17 15:56:55.48 +0000 UTC 0 2022-08-19 07:43:51.68 +0000 UTC 0
2022-01-17 15:56:56.48 +0000 UTC 1 2022-08-19 07:43:52.68 +0000 UTC 1
2022-01-17 15:56:57.48 +0000 UTC 2 2022-08-19 07:43:53.68 +0000 UTC 2
2022-01-17 15:56:58.48 +0000 UTC 3 2022-08-19 07:43:54.68 +0000 UTC 3
2022-01-17 15:58:01.842 +0000 UTC 0
2022-01-17 15:58:02.842 +0000 UTC 1
2022-01-17 15:58:03.842 +0000 UTC 2
2022-01-17 15:58:04.842 +0000 UTC 3
2022-01-18 01:43:48.029 +0000 UTC 0
2022-01-18 01:43:49.029 +0000 UTC 1
2022-01-18 01:43:50.029 +0000 UTC 2
2022-01-18 01:43:51.029 +0000 UTC 3
``` ```
## 用 docker-compose 启动 TDengine 集群 ## 用 docker-compose 启动 TDengine 集群
1. 如下 docker-compose 文件启动一个 2 副本、2 管理节点、2 数据节点以及 1 个 arbitrator 的 TDengine 集群。 1. 如下 docker-compose 文件启动一个 三节点 TDengine 集群。
```docker ```yml
version: "3" version: "3"
services: services:
arbitrator: td-1:
image: tdengine/tdengine:$VERSION image: tdengine/tdengine:$VERSION
command: tarbitrator environment:
td-1: TAOS_FQDN: "td-1"
image: tdengine/tdengine:$VERSION TAOS_FIRST_EP: "td-1"
environment: volumes:
TAOS_FQDN: "td-1" - taosdata-td1:/var/lib/taos/
TAOS_FIRST_EP: "td-1" - taoslog-td1:/var/log/taos/
TAOS_NUM_OF_MNODES: "2" td-2:
TAOS_REPLICA: "2" image: tdengine/tdengine:$VERSION
TAOS_ARBITRATOR: arbitrator:6042 environment:
volumes: TAOS_FQDN: "td-2"
- taosdata-td1:/var/lib/taos/ TAOS_FIRST_EP: "td-1"
- taoslog-td1:/var/log/taos/ volumes:
td-2: - taosdata-td2:/var/lib/taos/
image: tdengine/tdengine:$VERSION - taoslog-td2:/var/log/taos/
environment: td-3:
TAOS_FQDN: "td-2" image: tdengine/tdengine:$VERSION
TAOS_FIRST_EP: "td-1" environment:
TAOS_NUM_OF_MNODES: "2" TAOS_FQDN: "td-3"
TAOS_REPLICA: "2" TAOS_FIRST_EP: "td-1"
TAOS_ARBITRATOR: arbitrator:6042 volumes:
volumes: - taosdata-td3:/var/lib/taos/
- taosdata-td2:/var/lib/taos/ - taoslog-td3:/var/log/taos/
- taoslog-td2:/var/log/taos/ volumes:
volumes: taosdata-td1:
taosdata-td1: taoslog-td1:
taoslog-td1: taosdata-td2:
taosdata-td2: taoslog-td2:
taoslog-td2: taosdata-td3:
``` taoslog-td3:
```
:::note :::note
- `VERSION` 环境变量被用来设置 tdengine image tag * `VERSION` 环境变量被用来设置 tdengine image tag
- 在新创建的实例上必须设置 `TAOS_FIRST_EP` 以使其能够加入 TDengine 集群；如果有高可用需求，则需要同时使用 `TAOS_SECOND_EP` * 在新创建的实例上必须设置 `TAOS_FIRST_EP` 以使其能够加入 TDengine 集群；如果有高可用需求，则需要同时使用 `TAOS_SECOND_EP`
- `TAOS_REPLICA` 用来设置缺省的数据库副本数量，其取值范围为[1,3] :::
在双副本环境下，推荐使用 arbitrator, 用 TAOS_ARBITRATOR 来设置
:::
2. 启动集群 2. 启动集群
```shell ```shell
$ VERSION=2.4.0.0 docker-compose up -d $ VERSION=3.0.0.0 docker-compose up -d
Creating network "test_default" with the default driver Creating network "test-docker_default" with the default driver
Creating volume "test_taosdata-td1" with default driver Creating volume "test-docker_taosdata-td1" with default driver
Creating volume "test_taoslog-td1" with default driver Creating volume "test-docker_taoslog-td1" with default driver
Creating volume "test_taosdata-td2" with default driver Creating volume "test-docker_taosdata-td2" with default driver
Creating volume "test_taoslog-td2" with default driver Creating volume "test-docker_taoslog-td2" with default driver
Creating test_td-1_1 ... done Creating volume "test-docker_taosdata-td3" with default driver
Creating test_arbitrator_1 ... done Creating volume "test-docker_taoslog-td3" with default driver
Creating test_td-2_1 ... done
``` Creating test-docker_td-3_1 ... done
Creating test-docker_td-1_1 ... done
Creating test-docker_td-2_1 ... done
```
3. 查看节点状态 3. 查看节点状态
```shell ```shell
$ docker-compose ps docker-compose ps
Name Command State Ports Name Command State Ports
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
test_arbitrator_1 /usr/bin/entrypoint.sh tar ... Up 6030/tcp, 6031/tcp, 6032/tcp, 6033/tcp, 6034/tcp, 6035/tcp, 6036/tcp, 6037/tcp, 6038/tcp, 6039/tcp, 6040/tcp, 6041/tcp, 6042/tcp -------------------------------------------------------------------
test_td-1_1 /usr/bin/entrypoint.sh taosd Up 6030/tcp, 6031/tcp, 6032/tcp, 6033/tcp, 6034/tcp, 6035/tcp, 6036/tcp, 6037/tcp, 6038/tcp, 6039/tcp, 6040/tcp, 6041/tcp, 6042/tcp test-docker_td-1_1 /tini -- /usr/bin/entrypoi ... Up
test_td-2_1 /usr/bin/entrypoint.sh taosd Up 6030/tcp, 6031/tcp, 6032/tcp, 6033/tcp, 6034/tcp, 6035/tcp, 6036/tcp, 6037/tcp, 6038/tcp, 6039/tcp, 6040/tcp, 6041/tcp, 6042/tcp test-docker_td-2_1 /tini -- /usr/bin/entrypoi ... Up
``` test-docker_td-3_1 /tini -- /usr/bin/entrypoi ... Up
```
4. 用 taos shell 查看 dnodes 4. 用 taos shell 查看 dnodes
```shell ```shell
$ docker-compose exec td-1 taos -s "show dnodes"
taos> show dnodes $ docker-compose exec td-1 taos -s "show dnodes"
id | end_point | vnodes | cores | status | role | create_time | offline reason |
====================================================================================================================================== taos> show dnodes
1 | td-1:6030 | 1 | 8 | ready | any | 2022-01-18 02:47:42.871 | |
2 | td-2:6030 | 0 | 8 | ready | any | 2022-01-18 02:47:43.518 | | id | endpoint | vnodes | support_vnodes | status | create_time | note |
0 | arbitrator:6042 | 0 | 0 | ready | arb | 2022-01-18 02:47:43.633 | - | =================================================================================================================================================
Query OK, 3 row(s) in set (0.000811s)
``` 1 | td-1:6030 | 0 | 32 | ready | 2022-08-19 07:57:29.971 | |
2 | td-2:6030 | 0 | 32 | ready | 2022-08-19 07:57:31.415 | |
3 | td-3:6030 | 0 | 32 | ready | 2022-08-19 07:57:31.417 | |
Query OK, 3 rows in database (0.021262s)
```
## taosAdapter ## taosAdapter
@ -362,93 +378,80 @@ password: taosdata
2. 同时为了部署灵活起见，可以在独立的容器中启动 taosAdapter 2. 同时为了部署灵活起见，可以在独立的容器中启动 taosAdapter
```docker ```docker
services: services:
# ... # ...
adapter: adapter:
image: tdengine/tdengine:$VERSION image: tdengine/tdengine:$VERSION
command: taosadapter command: taosadapter
``` ```
如果要部署多个 taosAdapter 来提高吞吐量并提供高可用性，推荐配置方式为使用 nginx 等反向代理来提供统一的访问入口。具体配置方法请参考 nginx 的官方文档。如下是示例： 如果要部署多个 taosAdapter 来提高吞吐量并提供高可用性，推荐配置方式为使用 nginx 等反向代理来提供统一的访问入口。具体配置方法请参考 nginx 的官方文档。如下是示例：
```docker ```yml
version: "3" version: "3"
networks: networks:
inter: inter:
api:
services: services:
arbitrator: td-1:
image: tdengine/tdengine:$VERSION image: tdengine/tdengine:$VERSION
command: tarbitrator networks:
networks: - inter
- inter environment:
td-1: TAOS_FQDN: "td-1"
image: tdengine/tdengine:$VERSION TAOS_FIRST_EP: "td-1"
networks: volumes:
- inter - taosdata-td1:/var/lib/taos/
environment: - taoslog-td1:/var/log/taos/
TAOS_FQDN: "td-1" td-2:
TAOS_FIRST_EP: "td-1" image: tdengine/tdengine:$VERSION
TAOS_NUM_OF_MNODES: "2" networks:
TAOS_REPLICA: "2" - inter
TAOS_ARBITRATOR: arbitrator:6042 environment:
volumes: TAOS_FQDN: "td-2"
- taosdata-td1:/var/lib/taos/ TAOS_FIRST_EP: "td-1"
- taoslog-td1:/var/log/taos/ volumes:
td-2: - taosdata-td2:/var/lib/taos/
image: tdengine/tdengine:$VERSION - taoslog-td2:/var/log/taos/
networks: adapter:
- inter image: tdengine/tdengine:$VERSION
environment: entrypoint: "taosadapter"
TAOS_FQDN: "td-2" networks:
TAOS_FIRST_EP: "td-1" - inter
TAOS_NUM_OF_MNODES: "2" environment:
TAOS_REPLICA: "2" TAOS_FIRST_EP: "td-1"
TAOS_ARBITRATOR: arbitrator:6042 TAOS_SECOND_EP: "td-2"
volumes: deploy:
- taosdata-td2:/var/lib/taos/ replicas: 4
- taoslog-td2:/var/log/taos/ nginx:
adapter: image: nginx
image: tdengine/tdengine:$VERSION depends_on:
command: taosadapter - adapter
networks: networks:
- inter - inter
environment: ports:
TAOS_FIRST_EP: "td-1" - 6041:6041
TAOS_SECOND_EP: "td-2" - 6044:6044/udp
deploy: command: [
replicas: 4 "sh",
nginx: "-c",
image: nginx "while true;
depends_on: do curl -s http://adapter:6041/-/ping >/dev/null && break;
- adapter done;
networks: printf 'server{listen 6041;location /{proxy_pass http://adapter:6041;}}'
- inter > /etc/nginx/conf.d/rest.conf;
- api printf 'stream{server{listen 6044 udp;proxy_pass adapter:6044;}}'
ports: >> /etc/nginx/nginx.conf;cat /etc/nginx/nginx.conf;
- 6041:6041 nginx -g 'daemon off;'",
- 6044:6044/udp ]
command: [ volumes:
"sh", taosdata-td1:
"-c", taoslog-td1:
"while true; taosdata-td2:
do curl -s http://adapter:6041/-/ping >/dev/null && break; taoslog-td2:
done; ```
printf 'server{listen 6041;location /{proxy_pass http://adapter:6041;}}'
> /etc/nginx/conf.d/rest.conf;
printf 'stream{server{listen 6044 udp;proxy_pass adapter:6044;}}'
>> /etc/nginx/nginx.conf;cat /etc/nginx/nginx.conf;
nginx -g 'daemon off;'",
]
volumes:
taosdata-td1:
taoslog-td1:
taosdata-td2:
taoslog-td2:
```
## 使用 docker swarm 部署 ## 使用 docker swarm 部署
@ -457,50 +460,46 @@ password: taosdata
docker-compose 文件可以参考上节。下面是使用 docker swarm 启动 TDengine 的命令： docker-compose 文件可以参考上节。下面是使用 docker swarm 启动 TDengine 的命令：
```shell ```shell
$ VERSION=2.4.0 docker stack deploy -c docker-compose.yml taos $ VERSION=3.0.0.0 docker stack deploy -c docker-compose.yml taos
Creating network taos_inter Creating network taos_inter
Creating network taos_api Creating service taos_nginx
Creating service taos_arbitrator
Creating service taos_td-1 Creating service taos_td-1
Creating service taos_td-2 Creating service taos_td-2
Creating service taos_adapter Creating service taos_adapter
Creating service taos_nginx
``` ```
查看和管理 查看和管理
```shell ```shell
$ docker stack ps taos $ docker stack ps taos
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
79ni8temw59n taos_nginx.1 nginx:latest TM1701 Running Running about a minute ago 7m3sbf532bqp taos_adapter.1 tdengine/tdengine:3.0.0.0 vm98 Running Running about a minute ago
3e94u72msiyg taos_adapter.1 tdengine/tdengine:2.4.0 TM1702 Running Running 56 seconds ago pj403n6ofmmh taos_adapter.2 tdengine/tdengine:3.0.0.0 vm98 Running Running about a minute ago
100amjkwzsc6 taos_td-2.1 tdengine/tdengine:2.4.0 TM1703 Running Running about a minute ago rxqfwsyk5q1h taos_adapter.3 tdengine/tdengine:3.0.0.0 vm98 Running Running about a minute ago
pkjehr2vvaaa taos_td-1.1 tdengine/tdengine:2.4.0 TM1704 Running Running 2 minutes ago qj40lpxr40oc taos_adapter.4 tdengine/tdengine:3.0.0.0 vm98 Running Running about a minute ago
tpzvgpsr1qkt taos_arbitrator.1 tdengine/tdengine:2.4.0 TM1705 Running Running 2 minutes ago oe3455ulxpze taos_nginx.1 nginx:latest vm98 Running Running about a minute ago
rvss3g5yg6fa taos_adapter.2 tdengine/tdengine:2.4.0 TM1706 Running Running 56 seconds ago o0tsg70nrrc6 taos_td-1.1 tdengine/tdengine:3.0.0.0 vm98 Running Running about a minute ago
i2augxamfllf taos_adapter.3 tdengine/tdengine:2.4.0 TM1707 Running Running 56 seconds ago q5m1oxs589cp taos_td-2.1 tdengine/tdengine:3.0.0.0 vm98 Running Running about a minute ago
lmjyhzccpvpg taos_adapter.4 tdengine/tdengine:2.4.0 TM1708 Running Running 56 seconds ago
$ docker service ls $ docker service ls
ID NAME MODE REPLICAS IMAGE PORTS ID NAME MODE REPLICAS IMAGE PORTS
561t4lu6nfw6 taos_adapter replicated 4/4 tdengine/tdengine:2.4.0 ozuklorgl8bs taos_adapter replicated 4/4 tdengine/tdengine:3.0.0.0
3hk5ct3q90sm taos_arbitrator replicated 1/1 tdengine/tdengine:2.4.0 crmhdjw6vxw0 taos_nginx replicated 1/1 nginx:latest *:6041->6041/tcp, *:6044->6044/udp
d8qr52envqzu taos_nginx replicated 1/1 nginx:latest *:6041->6041/tcp, *:6044->6044/udp o86ngy7csv5n taos_td-1 replicated 1/1 tdengine/tdengine:3.0.0.0
2isssfvjk747 taos_td-1 replicated 1/1 tdengine/tdengine:2.4.0 rma040ny4tb0 taos_td-2 replicated 1/1 tdengine/tdengine:3.0.0.0
9pzw7u02ichv taos_td-2 replicated 1/1 tdengine/tdengine:2.4.0
``` ```
从上面的输出可以看到有两个 dnode， 和两个 taosAdapter，以及一个 nginx 反向代理服务。 从上面的输出可以看到有两个 dnode， 和四个 taosAdapter，以及一个 nginx 反向代理服务。
接下来，我们可以减少 taosAdapter 服务的数量 接下来，我们可以减少 taosAdapter 服务的数量
```shell ```shell
$ docker service scale taos_adapter=1 $ docker service scale taos_adapter=1
taos_adapter scaled to 1 taos_adapter scaled to 1
overall progress: 1 out of 1 tasks overall progress: 1 out of 1 tasks
1/1: running [==================================================>] 1/1: running [==================================================>]
verify: Service converged verify: Service converged
$ docker service ls -f name=taos_adapter $ docker service ls -f name=taos_adapter
ID NAME MODE REPLICAS IMAGE PORTS ID NAME MODE REPLICAS IMAGE PORTS
561t4lu6nfw6 taos_adapter replicated 1/1 tdengine/tdengine:2.4.0 ozuklorgl8bs taos_adapter replicated 1/1 tdengine/tdengine:3.0.0.0
``` ```