Elasticsearch is a distributed, open source search and analytics engine for all types of data, including textual, numerical, geospatial, structured, and unstructured. After installing Elasticsearch the application failed to start with a bootstrap error. Problem ERROR: bootstrap checks failed max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536] max number of threads [1024] for…
Read More »
While playing with Plex and Emby on different virtual machines, I thought it would be a fun exercise to install Emby on a NetGear ReadyNAS Pro. Emby is a media server designed to organize, play, and stream audio and video to a variety of devices. The problem was the ReadyNAS Pro firmware was 4.x.x and Emby server supports 6.8.0 or greater. …
Read More »
The NetGear ReadyNAS Pro can be a fantastic addition to any environment. Aside from a flaky power supply which wasn’t too difficult to replace, (Another story for another time.), this box has been relatively descent. Well the power supply issue was big and annoying. The other annoying aspect to this NAS is it’s dated firmware which displays this awful web page…
Read More »There is a known working samba share. There are servers that connect to it. All of them happen to be Windows boxes. However, wanted to connect a Linux (CentOS 7) to it. When testing for a connection, it failed with an error message. The command and the error. The resolution turned out to be a simple one. Update the client…
Read More »User creation and password changes can be handled as one-liners for as long as you use the correct commands. Today I learned of another password utility other than passwd. It is chpasswd, a powerful tool to change passwords without the prompt and the password can be encrypted. User Creation To create a user may be a two step process. First…
Read More »
It seems like it would be very easy to share a folder on your Windows 10 computer to other Windows users in a home network by using your file explorer, right clicking on a folder, under properties, select sharing, then advanced sharing, and share the folder. It doesn’t work as one would expect. This is particularly annoying as the home…
Read More »There seems to be several solutions offered for renaming all files in a directory from mixed or upper case to all lowercase names. Of the solutions, one of the worked without issue. ls | while read upName; do loName=`echo “${upName}” | tr ‘[:upper:]’ ‘[:lower:]’`; mv “$upName” “$loName”; done Although this was found in an Ubuntu forum, it works flawlessly in…
Read More »There was a text file that contained non-ASCII characters that acted like spaces within the file, so I used the tried and true dos2unix command to attempt to clean the file; however, the characters remained. With hundreds of lines to correct, manually deleting the offending areas of the file was not an option. A real solution is needed. Once again,…
Read More »If you ever get in a bind and a log file has gone out of control and your disk space is full, you may be tempted to delete the log file. There may be a couple of problems with that. One, the application is still using the file so that delete may not actually take place until the application is…
Read More »Over the years, I have seen a couple of variations with the use of the chown command. The “:” (colon) vs “.” (dot). While studying for the RHEL6 exam sometime ago, the books that I had used each had one or the other in their documentation. I have read that the posix standard is using chown with the “:” (colon)….
Read More »Lenovo provides an ISO for CD/DVD burning and an EXE for running the executable from within Windows. There is NO support for an ISO booting from a USB. Many modern laptops are ordered without a CD ROM and maybe an extra hard drive in it’s place. Most people use USB sticks for the majority of their effort when the need…
Read More »i made a change to the /etc/fstab that looked perfectly fine until I rebooted the system (CentOS 6) running as a virtual machine. The system did not start, there was a Kernel panic, and using the single boot mode did not provide any access to the system. I changed the “/” partition to a UUID number after changing the volume…
Read More »How to test an open port without having the application installed. Suppose you have a situation where you just created a new Linux server (CentOS 6) and you will eventually have an application run on Tomcat port 8080/tcp. You will want this application to use some sort of a Reverse Proxy and this all goes through a firewall that sits…
Read More »Customizing a kickstart file to meet your requirements can be challenging. One typo or incorrect setting and it simply won’t work. Validation of a success or fail can be achieved with a time consuming reboot. However, there is a quicker solution. Be certain to validate the kickstart on the same operating system version as the kickstart file or you may…
Read More »
Pi-Hole is the black hole for the internet. As of the most recent Pi-hole Version v2.13.2 with Web Interface Version v2.5.2, a local network should have the necessary tools, DNS and DHCP servers, to run successfully. With that said, what if you want custom DNS settings? I tried this approach successfully, so now one IP resolves to several domain names….
Read More »
Adding a root authority certificate to a server that does not already have the cert may be added to the server manually. CentOS 6 Install the ca-certificates package: yum install ca-certificates Enable the dynamic CA configuration feature: update-ca-trust force-enable Add it as a new file to /etc/pki/ca-trust/source/anchors/: cp foo.crt /etc/pki/ca-trust/source/anchors/ Use command: update-ca-trust extract CentOS 7 CentOS 7.0 and later…
Read More » For whatever the reason, the /etc/pki/tls/certs/ca-bundle.crt file may get corrupted, in my case, accidentally overwritten. I could have gone the route of copying the ca-bundle.crt file from another vanilla server, but I wanted a more elegant solution. There is one, download a new certificate bundle. Download the new certificate bundle. Since my ca-bundle.crt was overwritten, there was no need to…
Read More »