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1500 questions
83
votes
13 answers

How does a team of Systems Administrators share passwords securely?

What are best practices for sharing hundreds of passwords among a few people? These passwords protect mission critical data, and cannot ever be visible beyond a small team.
Chris Henry
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83
votes
10 answers

How to check what port mysql is running on

On my windows dev box mysql is running on port 3306 How can I check what port it is running on the unix server that I have to upload the app to.
Ankur
  • 2,379
82
votes
24 answers

Storing a million images in the filesystem

I have a project that will generate a huge number of images. Around 1,000,000 for start. They are not large images so I will store them all on one machine at start. How do you recommended on storing these images efficiently? (NTFS file system…
s.mihai
  • 1,509
82
votes
3 answers

Modify systemd unit file without altering upstream unit file

I have installed the pimd service by means of apt. This comes with an upstream systemd unit file (/lib/systemd/system/pimd.service). I want the service to be restarted when for some reason it gets killed, hence I wish to add the line Restart =…
giomanda
  • 1,824
82
votes
12 answers

Transfer 15TB of tiny files

I'm archiving data from one server to another. Initially I started a rsync job. It took 2 weeks for it to build the file list just for 5 TB of data and another week to transfer 1 TB of data. Then I had to kill the job as we need some down time on…
lbanz
  • 1,609
82
votes
2 answers

Downloading docker image for transfer to non-internet-connected machine

I'm working in an office where my laptop is internet-connected, but tightly controlled. I am not allowed to install unauthorized software onto it. My development workstation is mine to do with as I please, but it does not have an internet…
shearn89
  • 3,513
82
votes
2 answers

How to open port for a specific IP address with firewall-cmd on CentOS?

I would like to open port 4567 for the IP address 1.2.3.4 with the firewall-cmd command on a CentOS 7.1 server. How can I achieve this, as the documentation I could find was too specific on this?
Michaël Perrin
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82
votes
3 answers

How does vm.overcommit_memory work?

When I use the default settings: vm.overcommit_memory = 0 vm.overcommit_ratio = 50 I can read these values from /proc/meminfo file: CommitLimit: 2609604 kB Committed_AS: 1579976 kB But when I change vm.overcommit_memory from 0 to 2, I'm…
Mikhail Morfikov
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82
votes
6 answers

Make a Docker application write to stdout

I'm deploying a 3rd-party application in compliance with the 12 factor advisory, and one of the points tell that application logs should be printed to stdout/stderr: then clustering software can collect it. However, the application can only write to…
kolypto
  • 11,218
82
votes
8 answers

Apache2 config variable is not defined

I installed apache2 on ubuntu 13.10. If I try to restart it using sudo /etc/init.d/apache2 restart I get this message: AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName'…
Kurt Bourbaki
  • 923
82
votes
5 answers

Choosing between meaningful and meaningless hostnames

Assume an environment with a puppet-managed cluster of different servers - various hardware, software, operating systems, virtual/dedicated, etc. Would you choose meaningful hostnames (mysqlmaster01..99, mysqlslave001..999, vpnprimary, vpnbackup,…
keymone
  • 958
82
votes
7 answers

Log all commands run by admins on production servers

It is company policy for admins to login to the servers via a personal username, and then run sudo -i to become root. Upon running sudo -i, sudo will create an environmental variable called SUDO_USER, which contains the original user's username. Is…
Soviero
  • 4,376
82
votes
4 answers

Running Cron every 2 hours

I have the cron job as shown below, and wanted it to run every 2 hours, but it keeps running every 2 minutes. Can someone tell me where I'm going wrong? * */2 * * * /path-to-script
Helen
  • 953
82
votes
5 answers

Dump nginx config from running process?

Apparently, I shouldn't have spent sleepless night trying to debug an application. I wanted to restart my nginx and discovered that its config file is empty. I don't remember truncating it, but fat fingers and reduced attention probably played their…
Sergio Tulentsev
  • 923
82
votes
6 answers

Do SPF Records For Primary Domain apply to subdomains?

I have a quick question regarding SPF records: Do they need to be present for all subdomains? Lets say that I have a TXT record with SPF info for domain.com Let's also say that I have a seperate email domain for subdomain.domain.com Will the SPF…
Mike B
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