Temporary SSH access on Linux servers

A while ago it was requested that developers should be able to login, upon request, on our production servers via SSH. Normally this is restricted to SysOps and DevOps operators. Developers have their DTA(P) to do their thing, but nevertheless management decided that they need CLI access to our live systems. Needless to say, we…

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Debian intro

My Debian intro! As I briefly pointed out in part 1 of the awesome ultimate CentOS server installation guide, I’m the happy owner of a new Linux related job. My first one since my Linux adventure started almost a year ago. A year ago I felt I had to make a decision about which distribution…

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Ultimate CentOS server setup guide 2018 – Part 2

Here we are again with part 2 of the CentOS ultimate server setup guide 2018. Following a most successful start with the basics, today we go a bit deeper with a few useful tools and must haves for your CentOS installation. There are a lot of guides out there, installing and configuring CentOS 7 and…

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Nextcloud 12 migration guide

Following one of the better decisions a couple of days ago, it was time today to re-install my webserver that runs Nextcloud. I made some errors setting it up, now almost a year ago. A couple of things could be fixed, a couple of things I’d rather not and just build it from the ground…

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New Zimbra 8.7.11 server migration guide

In the past I haven’t been so kind about the Zimbra Open Source Suite. Installing it in my own, configuring it, getting all my data to it and using it daily wasn’t a breeze. I found it especially difficult to keep it stable while ensuring security. I’ve also been somewhat active at the forums and…

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Setting up sysstat on CentOS 7.4

With my macOS background I previously always checked my server load primarily with the ‘top’ command. I still use it often to have a look at what my system is busy with at that very moment, but it’s not so useful to check what it was busy with 10 minutes ago, yesterday or at any…

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Linux random security related stuff

Security. A couple of points I came across in the last couple of weeks. Some random ramblings really, how to make your Linux server (I myself am running CentOS 7.4 server) a bit more secure. There are way more elaborate posts on this blog, but every little bit counts. Since this year I have a…

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Cleaning unneeded kernel images on CentOS 7.4

Running OpenVAS I was shocked about a couple of high security warnings. Closer inspection thought me I had an old kernel that was vulnerable against attacks. I immediately ran yum update but there was nothing to update. Huh? A uname -r and I was relieved: I was actually up to date, but looking in /boot…

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Install OpenVAS on Fedora 26

After a lot of security related installations and modifications on my test server, I want to test if it is indeed secure. A couple of online scanners were discussed here and here for example, but I want to take it a few steps further. I came across OpenVAS in a training video and will be…

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Securing SSL / HTTPS

Securing SSL and HTTPS might seem like a contradiction to you, because SSL and HTTPS are secure right? Well, not entirely and always. There are some awesome tools out there that will get your website from an F to an A+. Check this out. This is a good example of always being on top of…

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Nextcloud security and performance tweaks

Our last post took care of a working Nextcloud installation. Afterwards I pumped 100GB of data to my cloud without a hickup. But, especially in multi-user production environments, there are certainly a couple of important security and performance tricks to be performed. So be sure to check out these tips. I think this post is…

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Complete Nextcloud 12 installation on CentOS 7.4

OK, so here’s the deal. I had ownCloud up and running and was rather happy with it. I’d chosen ownCloud because I knew it from a few years back when I was looking for a Dropbox alternative for a customer. Never heard about Nextcloud before… A few days after this installation, a few sync problems…

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