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Apply Hotfix to DM Clusters Online

If you need to dynamically replace the binaries of a service while the cluster is running (that is, to keep the cluster available during the replacement), you can use the tiup dm patch command. The command does the following:

  • Uploads the binary package for replacement to the target machine.
  • Takes the related nodes offline using the API.
  • Stops the target service.
  • Unpacks the binary package and replaces the service.
  • Starts the target service.

Syntax

tiup dm patch <cluster-name> <package-path> [flags]
  • <cluster-name>: The name of the cluster to be operated
  • <package-path>: The path to the binary package used for replacement

Preparation

You need to pack the binary package required for this command in advance according to the following steps:

  • Determine the name ${component} of the component to be replaced (dm-master, dm-worker ...), the ${version} of the component (v2.0.0, v2.0.1 ...), and the operating system ${os} and platform ${arch} on which the component runs.
  • Download the current component package using the command wget https://tiup-mirrors.pingcap.com/${component}-${version}-${os}-${arch}.tar.gz -O /tmp/${component}-${version}-${os}-${arch}.tar.gz.
  • Run mkdir -p /tmp/package && cd /tmp/package to create a temporary directory to pack files.
  • Run tar xf /tmp/${component}-${version}-${os}-${arch}.tar.gz to unpack the original binary package.
  • Run find . to view the file structure in the temporary package directory.
  • Copy the binary files or configuration files to the corresponding locations in the temporary directory.
  • Run tar czf /tmp/${component}-hotfix-${os}-${arch}.tar.gz * to pack the files in the temporary directory.
  • Finally, you can use /tmp/${component}-hotfix-${os}-${arch}.tar.gz as the value of <package-path> in the tiup dm patch command.

Options

--overwrite

  • After you patch a certain component (such as dm-worker), when the tiup-dm scales out the component, tiup-dm uses the original component version by default. To use the version that you patch when the cluster scales out in the future, you need to specify the option --overwrite in the command.
  • Data type: BOOLEAN
  • This option is disabled by default with the false value. To enable this option, add this option to the command, and either pass the true value or do not pass any value.

-N, --node

  • Specifies the nodes to be replaced. The value of this option is a comma-separated list of node IDs. You can get the node IDs from the first column of the cluster status table returned by the [tiup dm display](/tiup/tiup-component-dm-display.md) command.
  • Data type: STRING
  • If this option is not specified, TiUP selects all nodes to replace by default.

-R, --role

  • Specifies the roles to be replaced. The value of this option is a comma-separated list of the roles of the nodes. You can get the roles of the nodes from the second column of the cluster status table returned by the [tiup dm display](/tiup/tiup-component-dm-display.md) command.
  • Data type: STRING
  • If this option is not specified, TiUP selects all roles to replace by default.

--offline

  • Declares that the current cluster is offline. When this option is specified, TiUP DM only replaces the binary files of the cluster components in place without restarting the service.

-h, --help

  • Prints help information.
  • Data type: BOOLEAN
  • This option is disabled by default with the false value. To enable this option, add this option to the command, and either pass the true value or do not pass any value.

Example

The following example shows how to apply v5.3.0-hotfix to the v5.3.0 cluster deployed using TiUP. The operations might vary if you deploy the cluster using other methods.

Preparations

Before applying a hotfix, prepare the hotfix package dm-linux-amd64.tar.gz and confirm the current DM software version:

/home/tidb/dm/deploy/dm-master-8261/bin/dm-master/dm-master -V

Output:

Release Version: v5.3.0 Git Commit Hash: 20626babf21fc381d4364646c40dd84598533d66 Git Branch: heads/refs/tags/v5.3.0 UTC Build Time: 2021-11-29 08:29:49 Go Version: go version go1.16.4 linux/amd64

Prepare the patch package and apply it to the DM cluster

  1. Prepare the DM software package that matches the current version:

    mkdir -p /tmp/package tar -zxvf /root/.tiup/storage/dm/packages/dm-master-v5.3.0-linux-amd64.tar.gz -C /tmp/package/ tar -zxvf /root/.tiup/storage/dm/packages/dm-worker-v5.3.0-linux-amd64.tar.gz -C /tmp/package/
  2. Replace the binary file with the hotfix package:

    # Decompress the hotfix package and use it to replace the binary file. cd /root; tar -zxvf dm-linux-amd64.tar.gz cp /root/dm-linux-amd64/bin/dm-master /tmp/package/dm-master/dm-master cp /root/dm-linux-amd64/bin/dm-worker /tmp/package/dm-worker/dm-worker # Re-package the modified files. # Note that the packaging method might be different for other deployment methods. cd /tmp/package/ && tar -czvf dm-master-hotfix-linux-amd64.tar.gz dm-master/ cd /tmp/package/ && tar -czvf dm-worker-hotfix-linux-amd64.tar.gz dm-worker/
  3. Apply the hotfix:

    Query the cluster status. The following uses the cluster named dm-test as an example:

    tiup dm display dm-test

    Output:

    Cluster type: dm Cluster name: dm-test Cluster version: v5.3.0 Deploy user: tidb SSH type: builtin ID Role Host Ports OS/Arch Status Data Dir Deploy Dir -- ---- ---- ----- ------- ------ -------- ---------- 172.16.100.21:9093 alertmanager 172.16.100.21 9093/9094 linux/x86_64 Up /home/tidb/dm/data/alertmanager-9093 /home/tidb/dm/deploy/alertmanager-9093 172.16.100.21:8261 dm-master 172.16.100.21 8261/8291 linux/x86_64 Healthy|L /home/tidb/dm/data/dm-master-8261 /home/tidb/dm/deploy/dm-master-8261 172.16.100.21:8262 dm-worker 172.16.100.21 8262 linux/x86_64 Free /home/tidb/dm/data/dm-worker-8262 /home/tidb/dm/deploy/dm-worker-8262 172.16.100.21:3000 grafana 172.16.100.21 3000 linux/x86_64 Up - /home/tidb/dm/deploy/grafana-3000 172.16.100.21:9090 prometheus 172.16.100.21 9090 linux/x86_64 Up /home/tidb/dm/data/prometheus-9090 /home/tidb/dm/deploy/prometheus-9090 Total nodes: 5

    Apply the hotfix to the specified node or specified role. If both -R and -N are specified, the intersection will be taken.

    # Apply hotfix to a specified node. tiup dm patch dm-test dm-master-hotfix-linux-amd64.tar.gz -N 172.16.100.21:8261 tiup dm patch dm-test dm-worker-hotfix-linux-amd64.tar.gz -N 172.16.100.21:8262 # Apply hotfix to a specified role. tiup dm patch dm-test dm-master-hotfix-linux-amd64.tar.gz -R dm-master tiup dm patch dm-test dm-worker-hotfix-linux-amd64.tar.gz -R dm-worker
  4. Query the hotfix application result:

    /home/tidb/dm/deploy/dm-master-8261/bin/dm-master/dm-master -V

    Output:

    Release Version: v5.3.0-20211230 Git Commit Hash: ca7070c45013c24d34bd9c1e936071253451d707 Git Branch: heads/refs/tags/v5.3.0-20211230 UTC Build Time: 2022-01-05 14:19:02 Go Version: go version go1.16.4 linux/amd64

    The cluster information changes accordingly:

    tiup dm display dm-test

    Output:

    Starting component `dm`: /root/.tiup/components/dm/v1.8.1/tiup-dm display dm-test Cluster type: dm Cluster name: dm-test Cluster version: v5.3.0 Deploy user: tidb SSH type: builtin ID Role Host Ports OS/Arch Status Data Dir Deploy Dir -- ---- ---- ----- ------- ------ -------- ---------- 172.16.100.21:9093 alertmanager 172.16.100.21 9093/9094 linux/x86_64 Up /home/tidb/dm/data/alertmanager-9093 /home/tidb/dm/deploy/alertmanager-9093 172.16.100.21:8261 dm-master (patched) 172.16.100.21 8261/8291 linux/x86_64 Healthy|L /home/tidb/dm/data/dm-master-8261 /home/tidb/dm/deploy/dm-master-8261 172.16.100.21:8262 dm-worker (patched) 172.16.100.21 8262 linux/x86_64 Free /home/tidb/dm/data/dm-worker-8262 /home/tidb/dm/deploy/dm-worker-8262 172.16.100.21:3000 grafana 172.16.100.21 3000 linux/x86_64 Up - /home/tidb/dm/deploy/grafana-3000 172.16.100.21:9090 prometheus 172.16.100.21 9090 linux/x86_64 Up /home/tidb/dm/data/prometheus-9090 /home/tidb/dm/deploy/prometheus-9090 Total nodes: 5

<< Back to the previous page - TiUP DM command list

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