How do I run a shell script in chef?

You’d put your script in files/default/. In default. rb, which would have a ‘cookbook_file’ resource that places the script onto the host, and the above execute command. You’d then upload the cookbook to the chef server and add recipe[COOKBOOKNAME] to the runlist of your node.

What are phases of chef execution?

There are two stages to a chef run though. A compile phase, to organise what resources need to be run and resolve all variables. Then a run phase where each resource is actually executed. You can write recipes that trigger actions during the compile phase which may make it seem out of order.

How do you execute a resource in chef?

Use the execute resource to execute a single command. Commands that are executed with this resource are (by their nature) not idempotent, as they are typically unique to the environment in which they are run. Use not_if and only_if to guard this resource for idempotence.

How do I debug a Bash script?

The debugging options available in the Bash shell can be switched on and off in multiple ways. Within scripts, we can either use the set command or add an option to the shebang line. However, another approach is to explicitly specify the debugging options in the command-line while executing the script.

How do Bash scripts work?

A Bash script is a text file containing a series of commands. Any command that can be executed in the terminal can be put into a Bash script. Any series of commands to be executed in the terminal can be written in a text file, in that order, as a Bash script. Bash scripts are given an extension of .

What is OHAI in chef?

What is Ohai? Ohai is a tool that is used to collect system configuration data, which is provided to the chef-client for use within cookbooks. Ohai is run by the chef-client at the beginning of every Chef run to determine system state.

What is chef convergence?

Convergence is when the configuration management system brings the node into compliance with policy. In other words, the node is configured based on the roles and recipes in its run list. Convergence in Chef happens in two phases. Compile. Execute.

How does Chef client communicates with Chef server?

Chef nodes communicate with the Chef server using an application called “chef-client”. Chef architecture works on pull configuration that means we don’t have to perform any actions on the Chef server to push the configurations to Chef nodes.

What is the syntax for Chef apply?

This command has the following syntax: chef-apply name_of_recipe. rb This tool has the following options: -e RECIPE_TEXT, –execute RECIPE_TEXT Use to execute a resource using a string. -l LEVEL, –log_level LEVEL The level of logging that will be stored in a log file.

How can I test shell script without running it?

Use the “-n” option bash will check the syntactical validity of a script without running it.

How do I run a shell script in debug mode?

How to Enable Shell Script Debugging Mode in Linux?

1. Figure 1: Tracing HelloWorld.sh Output using -x option of bash.
2. Figure 2: Tracing OddEven.sh Output using -x option of bash.
3. Figure 3: Checking Syntax-Errors in OddEven.sh using -n option of bash.

What is bash on Mac?

A Unix shell is nothing but a program that accepts Unix commands from the keyboard and executes them. For a long time, the bash was a default shell in macOS. However, Apple replaced Bourne Again SHell with Z shell for licensing reasons.

How do I run a bash command?

In order to run a Bash script on your system, you have to use the “bash” command and specify the script name that you want to execute, with optional arguments. Alternatively, you can use “sh” if your distribution has the sh utility installed.

How do I run a bash script?

Make a Bash Script Executable

1. 1) Create a new text file with a . sh extension.
2. 2) Add #!/bin/bash to the top of it. This is necessary for the “make it executable” part.
3. 3) Add lines that you’d normally type at the command line.
4. 4) At the command line, run chmod u+x YourScriptFileName.sh.
5. 5) Run it whenever you need!

What happens with OHAI data during the chef-client run?

Nathen taught me that Ohai collects data about your system when run stand-alone or executed as one of the first steps during a chef-client run. Then, all that useful platform data is available through the node object within your recipes. Later, when I learned about attribute precedence, my face nearly melted.

What is bootstrap in chef?

A bootstrap is a process that installs the chef-client on a target system so that it can run as a chef-client and communicate with a Chef Server.

How does chef server and client communicate?

A workstation communicates with the Chef server using Knife and Chef command-line tools, while nodes communicate with the Chef server using the Chef client . Any changes made to your infrastructure code must pass through the Chef server to be applied to nodes.

What is Idempotence in chef?

When a resource is described as idempotent in the context of Chef in particular, it means that subsequent Chef runs after the resource has already been put into the desired state don’t count it as “updated” in the x/y resources updated message at the end of the run.

What is Bash in chef infra client?

The full syntax for all of the properties that are available to the bash resource is: bash is the resource. name is the name given to the resource block. action identifies which steps Chef Infra Client will take to bring the node into the desired state.

What is a bash resource block in chef?

A bash resource block executes scripts using Bash: The full syntax for all of the properties that are available to the bash resource is: bash is the resource. name is the name given to the resource block. action identifies which steps Chef Infra Client will take to bring the node into the desired state.

What should I set to false in chef infra client?

Set to false to run while Chef Infra Client is configuring the node (the converge phase ). Continue running a recipe if a resource fails for any reason. :quiet will not display the full stack trace and the recipe will continue to run if a resource fails. The number of attempts to catch exceptions and retry the resource.