Category Archives: How-to

rclone Systemd startup mount script

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Rclone is a command line utility used for reading and writing to almost any type of cloud or remote storage. From Google Drive to Ceph, rclone supports almost any cloud-based remote storage platform you can think of. You can perform upload, download or synchronisation operations between local storage and remote cloud storage, or between remote storage directly.

In addition to this, rclone has an experimental mount feature that lets a user mount a remote cloud storage provider, such as s3 or Google Drive, as a local filesystem. You can then use the mounted filesystem as if it were a local device, albeit with some performance considerations.

Before we get going, make sure you have rclone installed on your system and configured with a remote. 

Once you have a remote defined, it’s time to create the mountpoint and systemd script. I’ll be using Google Drive for this example, but the mount command works for any supported remote.

Create the mount point directory to use for the remote storage:

Next, create the below systemd script and edit it as required:

The important parts are detailed below, however, there are various other options are detailed on the rclone mount documentation page.

  • –config – the path to the config file created by rclone config. This is usually located in the users home directory.
  • gdrive:/ /mnt/google-drive – details two things; firstly the config name created in rclone config, and secondly the mount point on the local filesystem to use.

Once all this is in place you’ll need to start the service and enable the service at system startup (if required)

gitignore file for Go Projects

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This is a gitignore file for a Go project to ensure temporary files and build files are not added to git repository commits.

List of Bank Holidays For England in SQL Format

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First off let’s create a table to store the bank holiday values. You may need to adjust this slightly depending on your SQL server technology being used (this was tested on MySQL/ MariaDB Server) but this is standard SQL dialect and should work on any RDBMS that respects the current SQL standards.

The next step is to insert the bank holiday values below. This table is currently for 2012 up to 2019 for England and Wales.

For a more up to date list, please see my github page.

Please submit a PR if you have collated a list yourself, or have any updates to an existing list. The repository currently covers the UK, but I’d be more than happy to accept a PR for other countries! 

MySQL/ MariaDB Error Code: 1329. No data – zero rows fetched, selected, or processed

Category : How-to

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The above error can occur when calling a cursor results in no rows, or no more rows if called in a loop. Whilst the error message is descriptive about what has happened physically, you may wish to catch the error so that you can do something else, or simply replace the generic database error with something more meaningful. 

If you’re not sure what I’m talking about, run the following code on a MySQL or MariaDB database:

The response is:

In order to trap the error we need to define a CONTINUE HANDLER and DECLARE a variable for the CONTINUE HANDLER to set. We can then manage the No data exception simply by checking the variable.

Following on from the above example, we’ve introduced a variable ch_done. When this variable is set to 1 then the last cursor to be FETCHed returned No data. If it returns a zero then data was returned and all is well.

Remember, if you call multiple cursors in a row, you may need to reset the ch_done back to 0.

How to exit from a MySQL/ MariaDB Stored Procedure/ Function Prematurely

Category : How-to

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MySQL and MariaDB enable you to define your own error conditions and to report back to the SQL client both a return code and an error message. As soon as you raise the condition then MySQL/ MariaDB will halt any further execution of the code and report the error back to the client. This can help the user calling the function understand what went wrong, rather than seeing a generic database error message.

The above code defines a custom condition with an error code of 45000 which is the suggested user defined error code. Other error codes are available, which you may have seen, but are reserved by the database server to use for specific database error events – it’s best not to mix your user defined messages with these. The function then checks if the error_flag has been set and, if it has, halts further code execution and returns the error “An error occurred!” to the client.

View from MySQL Workbench

You could simplify this by just calling the below code at the point the error is detected, if you are already catching an error event in your stored procedure or function by simply using the below code without the error_flag declaration.

CockroachDB systemd script

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This is a simple systemd script for CockroachDB. It works for single node installations or multiple nodes, however you’ll need to manually join each node to the cluster before using the systemd script. 

Create the systemd file and add the following content:

Note that there are several paths specified in the above file which may need to be tailored to your installation requirements.

Run the following to enable the service on system start, and to start the CockroachDB service.

If your host belongs to a cluster, create a hosts file containing the hosts of other nodes in your cluster that will be read when starting your local node. For multiple nodes, use a comma to separate each hostname and port combination.

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