Converting crt to PEM
Took two steps:
openssl x509 -in input.crt -out input.der -outform DER
openssl x509 -in input.der -inform DER -out output.pem -outform PEM
For some reason, my home Internet connection stopped receiving large packets. This could be something with PMTU discovery blocks on the ISP side, or it could be something that I changed. An automated job which uploaded files using SSH (to be exact: scp) to my home stopped working. The failure was a time-out after the…
An update: I am adding a link to a post where I share my thoughts about the additional steps required to protect a Linux system against physical access to data. I add it at the top of this article, because I want some insight from you – the people who might read this post. It…
I’ve been using a WordPress Docker for some time now. My Docker is invoked through the docker-compose toolset, and it generally functions well. However, at times, specific configurations are needed. For instance, when adjusting the PHP file size limitation or adding mod_headers to address CORS issues on WordPress. The key is to override the Docker…
Sysstat package, for me, is a must on any Linux machine I get to deal with. It allows for easy collection of performance data, and it allows easy postmortem of past (short past, anyhow) problems. For me, the only change from RHEL4 defaults is by setting the time interval to one minute, in stead of…
Cluster fencing – Unlike many common thoughts, high-availability is not the highest priority of an high-availability cluster, but only the 2nd one. The highest priority of an high-availability cluster is maintenance of data integrity by prevention of multiple concurrent access of nodes to the shared disk. On different cluster, depending on the vendor, this can…
Centreon is a nice GUI wrapper for Nagios. It is using MySQL as its configuration engine, and it functions quite well. One thing Cacti can do but Centreon can’t is mass automatic addition of servers. I have had a new site with an installed Centreon, and I wanted to add about 40 servers to be…