Can I specify a port in an entry in my /etc/hosts on OS X? [duplicate]
No, the hosts file is simply a way to statically resolve names when no DNS server is present.
admin
Why is the response on localhost so slow?
For me, setting the ServerName property in httpd.conf fixed the delays (they were up to 10 seconds at worst): # ServerName gives the name and port that the server uses to identify itself. # This can often be determined automatically, but we recommend you specify # it explicitly to prevent problems during startup. # # … Read more
What is the debian-sys-maint MySQL user (and more)?
What is debian-sys-maint used for? One major thing it is used for is telling the server to roll the logs. It needs at least the reload and shutdown privilege. See the file /etc/logrotate.d/mysql-server It is used by the /etc/init.d/mysql script to get the status of the server. It is used to gracefully shutdown/reload the server. … Read more
SSD or HDD for server
One aspect of my job is designing and building large-scale storage systems (often known as “SANs”, or “Storage Area Networks”). Typically, we use a tiered approach with SSD’s and HDD’s combined. That said, each one has specific benefits. SSD’s almost always have a higher Cost-per-Byte. I can get 10k SAS 4kn HDD’s with a cost-per-gigabyte … Read more
Downloading docker image for transfer to non-internet-connected machine
Short: use the save CLI command. https://docs.docker.com/engine/reference/commandline/save/ You can pull the image on a computer that have access to the internet. sudo docker pull ubuntu Then you can save this image to a file sudo docker save -o ubuntu_image.docker ubuntu Transfer the file on the offline computer (USB/CD/whatever) and load the image from the file: … Read more
Ansible stuck on gathering facts
I was having a similar issue with Ansible ping on Vagrant, it just suddenly stuck for no reason and has previously worked absolutely fine. Unlike any other issue like ssh or connective issue, it just forever die with no timeout. One thing I did to resolve this issue is to clean ~/.ansible directory and it … Read more
Why Block Port 22 Outbound?
I don’t see that anyone has spelled out the specific risk with SSH port forwarding in detail. If you are inside a firewall and have outbound SSH access to a machine on the public internet, you can SSH to that public system and in the process create a tunnel so that people on the public … Read more
Do you skip a rack unit between servers?
If your servers use front to back flow-through cooling, as most rack mounted servers do, leaving gaps can actually hurt cooling. You don’t want the cold air to have any way to get to the hot aisle except through the server itself. If you need to leave gaps (for power concerns, floor weight issues, etc) … Read more
How can I set a short timeout with the ping command?
fping might be a better tool than the stock ping you are using. What OS are you on? “fping differs from ping in that you can specify any number of targets on the command line, or specify a file containing the lists of targets to ping.” “Instead of sending to one target until it times … Read more
Does changing default port number actually increase security? [closed]
It doesn’t provide any serious defense against a targetted attack. If your server is being targetted then, as you say, they will port scan you and find out where your doors are. However, moving SSH off the default port of 22 will deter some of the non-targetted and amateur script kiddie type attacks. These are … Read more