The Linux Page


Wordpress Twentyseventeen Theme Menu hidden by default!?!?

Screenshot of a Wordpress website with the problem fixed.I have a website where I use Wordpress as the CMS. It's good enough for  that website (frankly, unless you want a blog, it's rather limited to my point of view, but I'm crazy...)

In 2017, they created a theme called Twentyseventeen, which looks good and has most of the functionality I need. However, there is a huge bug:

The front page has a smartphone menu at the bottom of the page which opens HIDDEN. That's just plainly wrong. Either you put the menu at the top or you make sure that the menu gets shown, somehow.

Since I'm a programmer (at times I forget) I decided ...

Wordpress 2017 -- how do you get a summary in your Category and other lists?

I now also work on a Worpress website with theme 2017 (twentyseventeen) and I noticed that when I go to the Caegories or some other list of posts, I get the full posts.

Looking into it, I could not really see anything about it on the Internet. Strange.

The fact is that all you have to do is go back to each post (yeah, a tad bit tedious if you have hundreds already) and add the "Read more mark". The fact is that Wordpress does not seem to automatically add a feature to automatically calculte the summary of your posts. Maybe I missed it or I would need to install yet another plugin.. ...

tar: .../public_html/wp-content: file changed as we read it

I created a little script to generate a daily tarball as a backup of a customer website.

Everyday, though, I would get the following error:

tar: .../public_html/wp-content: file changed as we read it

As you can see, the website is using Wordpress.

The error, though, I could not replicate when I would run the tar command by hand. What gives?

Looking closer into it, I noticed that my crontab setup would actually run the cron.php at the same time as the backup would run:

# m h  dom mon dow   command
  0 3  *   *   *     /.../backups/

*/10 * *   *   *     cd /.../public_html ...

Polylang messes up my canonical link on my website


I reported this problem to the author who took a bit of time but ended up fixing the problem. If you still have a problem, you probably need to upgrade to the newest version.

I just created a new website and added a few plugins, one of which is Polylang. It generally works okay. Not what I really would like to have, but close enough for a Wordpress website.

Only, it has a horrible side effect:

I destroys the canonical URL which instead of appearing as expected appears with a "%pagename%" variable in it. This is because the module caches the results of a previous call ...

My Embedded YouTube Video Disappeared

Embedded videos from used to work just fine on my website.

Today, though, I just noticed that my video was not showing up on one of my pages. Looking into it, I found out that the problem was the protocol.

I'm not too sure whether it was my browser or YouTube,com (although I'm not too sure how would know...) but the fact is that the iframe source was using HTTP and the page I was viewing used HTTPS.

By editing the page and changing the video from HTTP to HTTPS resolved the issue. It is generally much better to always use encryption anyway.

xhtml2pdf generating an error under 14.04+

Note: This bug is fixed in Ubuntu 16.04

Working on a website I have to convert invoices to PDF so end users have the ability to print and share the invoices from the website.

In order to do that, I generate an HTML page with the invoice which also gets displayed in the website, and then convert that HTML to PDF with xhtml2pdf. I use that tool instead of whtmltopdf because it does not require X11 to work. The other tool is said to require Qt and X11 and we do not want those things on our backend servers.

So... I upgraded to 14.04 and the tool stopped working with an ugly error:


CRON Drupal says "HTTP/1.0 302 Found" about "/cgi-bin/ipdiags.ha" (AT&T U-Verse)

I run a few Drupal website and once per hour I run the cron.php script. I do it only once per hour because nothing changes so often on my websites so it would require faster refreshes.

Once in a while (relatively rarely now) I get a list of errors from CRON saying that the checks failed. The errors look something like this:

HTTP/1.0 302 Found
Location: /cgi-bin/ipdiags.ha
Pragma: no-cache
Content-Type: text/html

<html><meta http-equiv=Refresh content=0;url=/cgi-bin/ipdiags.ha>

As you can see, this is a 302 so a temporary error. ...

Repair a Cassandra Cluster

I use the Cassandra database cluster system to manage a new set of websites and once in a while I start getting many errors and the website stops working altogether.

When that happens, it is likely that Cassandra broke something in the temporary tables that it holds. The only way to go past that problem is to clear those tables. Until then, it will fail over and over again (they really would need some euristic to auto-clean up even if it means that you're losing some data.)

The command to repair the database, really quick, is as follow:

nodetool scrub snap_websites files

Note that ...

Why would Redirect and RedirectMatch in Apache2 not work?

As we are working on a new website, we had a problem where a redirect would not work. I tried both: a simple Redirect and a RedirectMatch as follow:

Redirect /
RedirectMatch permanent ^(.*)$$1

Both of these entries would not work at all.

I verified, to make sure, that the alias module was turned on. It was.

ls -l /var/apache2/mods-enabled

This did list the alias.conf and alias.load entries as expected.

So? What else?

Well... This was installed on a new server and we left the default entry in there:

ls -l ...

Useful online network tools

I'm starting this page and hope to think about it again at a later time when I find additional tools... but as I have network problems I often need these types of services to make sure I can get the information I need.

For more Network stuff, click on the Network tag!

What is your IP address?

Check your current IP address from your browser: [Super clean version!] [More advance and with ads...]

What is my DNS?

This one is for people who setup a DNS to make sure that it can accessed from all over the world. It ...

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  • Mozilla

    The VACUUM instruction is used by PostgreSQL to query the server in cleaning up the corresponding database cluster. The work done is simply to remove the unused rows and clearly mark them are available. The VACUUM FULL command will go the extra distance of pushing the data so as to make the tables as small as possible. The command can be run on a per table basis.

  • height
  • nested

    In computing, nested means an item defined inside another. It is most often used for loops, a loop can be declared inside another. The one inside is called the nested loop. In particular, two loops can be defined one after another or one inside the other. There is no other way to declare a loop.

  • proxy

    In networking, a proxy is an intermediate network connection used to hide a user or computer. Most large companies use multiple proxies to hide all of their different intranets. Technically, when using a proxy you actually send all your network data to that other computer and that computer is in charge of sending that data outside your organization. Very large companies generally have multiple levels of proxies.