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tiup dm patch

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.

Note:

If the option -R, --role is specified at the same time, TiUP then replaces service nodes that match both the requirements of -N, --node and -R, --role.

-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.

Note:

If the option -N, --node is specified at the same time, TiUP then replaces service nodes that match both the requirements of -N, --node and -R, --role.

--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.

Outputs

The execution log of tiup-dm.

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