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Version: v1.28.x LTS

Using Daemon Mode (Technical Preview)

Using Daemon Mode (Technical Preview)

Technical Preview Daemon mode is available in the `@next` version of Zowe CLI. The Zowe CLI @next release is a technical preview. Technical previews are for only testing and are not ready for production. Your feedback is valued and appreciated.

If you already installed the supported version @zowe-v1-lts, switch versions to try this feature. Daemon mode will be included in the next major Zowe release, V2.0.0-LTS. You can also install the @next release of Zowe CLI.

Feature overview#

Daemon mode significantly improves the performance of Zowe CLI commands by running Zowe CLI as a persistent background process (daemon). Running Zowe CLI as daemon lets Zowe absorb the one-time startup of Node.js modules, which results in significantly faster responses to Zowe commands.

Preparing for installation#

Review the following installation notes before you configure Zowe CLI to run in daemon mode:

  • Daemon mode does not function on z/OS UNIX System Services (USS) systems.
  • When you want to run Zowe CLI to run in daemon mode on z/Linux operating systems, you must build the daemon mode binary on the z/Linux systems. For information about how to build the binary, see Configure daemon mode on z/Linux operating systems. The sections Enable daemon mode and Disable daemon mode (in this article) do not apply to running Zowe CLI in daemon mode on z/Linux operating systems.
  • We do not recommend using daemon mode in an environment where multiple users use the same system. For example, a shared Linux server.
  • To enable daemon mode, ensure that you installed the @next release of Zowe CLI.
  • When you are running Zowe on a Windows operating system in a virtual environment (for example, Windows Sandbox), you might receive an error message that indicates that a library named VCRUNTIME140.dll is missing. To correct the error, install Visual C++ Redistributable for Visual Studio 2015. For more information, see Download Visual C++ Redistributable for Visual Studio 2015.

Enable daemon mode#

The following steps describe how to enable daemon mode and how to configure Zowe to run constantly in daemon mode.

  1. Open a terminal window and issue the following command:

    zowe daemon enable

    The command copies the Zowe executables for your operating system into the $ZOWE_CLI_HOME/bin (.zowe/bin) directory. The next command that you issue starts the daemon.

  2. Add the path to the Zowe executable to your PATH environment variable. For example:


    Important! Ensure that you position the path to your Zowe executables before the path into which NPM installed the Node.js script. For example, C:\Program Files\nodejs\zowe.cmd. For information about configuring environment variables, see the documentation for your computer's operating system.

    Alternative configuration: By default, the daemon binary creates or reuses a file in the user's home directory each time a Zowe CLI command runs. In some cases, this behavior might be undesirable. For example, the home directory resides on a network drive and has poor file performance. To change the location that the daemon uses, set the following environment variable for your operating system:

    • Windows: ZOWE_DAEMON_LOCK

      Specify an alternative path to the lock file that restricts access to the named pipe that the daemon uses for communication.

      Default: %HOMEPATH%\.zowe-daemon.lock

    • Linux and macOS: ZOWE_DAEMON

      Specify an alternative path to the socket that the daemon uses for communication.

      Default: $HOME/.zowe-daemon.sock

    Note: Complete the environment variable configuration step (Step 2) only once.

The following example illustrates running Zowe commands with the daemon mode enabled:

zowe --versionStarting a background process to increase performance ...7.0.0-next.202110211759
zowe --version7.0.0-next.202110211759

Disable daemon mode#

You can disable Zowe from running in daemon mode at any time. For example, daemon mode lacks functionality that you desire, such as viewing colored-coded commands.

Open a terminal window and issue the following command:

zowe daemon disable

The disable command removes the Zowe executables from your .zowe/bin directory and disables daemon mode.

Running Zowe commands in daemon mode#

When you run Zowe in daemon mode, you run all Zowe commands as you normally run them. The first time you run a command, it starts the daemon in the background automatically and runs your desired Zowe command. Since the first Zowe command starts the daemon, the first command usually runs slower than a traditional Zowe command. However, subsequent Zowe commands run significantly faster. The daemon continues to run in the background until you close your terminal window.

Note: When you are running Zowe CLI in daemon using a Git Bash terminal on a Windows operating system, special characters might display using the wrong code page. For example, the default code page 437 renders a form-feed character (\f) as an emoji (♀️). To correct the problem, issue the command 65001 to change the code page to UTF-8. If you want the change to be persistent, add the command to your .bashrc file.