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1500 questions
108
votes
7 answers

list all packages from a repository in ubuntu / debian

is there a command to see what packages are available from a certain ppa repository?
opensas
  • 1,211
108
votes
14 answers

Supervisor not loading new configuration files

I have a problem deploying Django app using Gunicorn and Supervisor. While I can make Gunicorn serving my app (by setting proper PYTHONPATH and running apropriate command, the one from supervisord config) I can't make supervisor to run it. It just…
grucha
  • 1,193
107
votes
11 answers

How to disable everything in crontab -l?

I just want to pause everything. Don't execute anything listed on crontab -l.
Alex
  • 8,839
107
votes
14 answers

Is Ping a reliable way to check if a server is available?

In my application I am pinging a server and waiting for a response. I am using this to determine whether the server is available and responsive or not. Is this a reliable way of determining availability? I assume a firewall could be filtering icmp…
Peter Kelly
  • 1,102
106
votes
11 answers

How can I get diff to show only added and deleted lines? If diff can't do it, what tool can?

How can I get diff to show only added and deleted lines? If diff can't do it, what tool can?
C. Ross
  • 3,125
106
votes
5 answers

Best way to gracefully restart CentOS?

I always used the command: shutdown -r now However, sometimes that causes MySQL issues. What's the most graceful way to restart CentOS? I've seen: reboot and halt How can I gently reboot the machine?
User
  • 1,425
106
votes
6 answers

How to delete cached temporarily credentials for a network share on a Windows machine without rebooting or logging off

This is more of a curiosity then a real problem, I am just to lazy to reboot or log off my laptop. I have connected to a network share on a Windows server with domain credentials from a non-domain Windows 7 machine, I didn't mark the option to…
ralz
  • 2,861
  • 3
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  • 23
106
votes
3 answers

Add comment to existing SSH public key

I have an existing SSH key (public and private), that was created with ssh-keygen. How can I add a comment to this existing key?
Martin
  • 1,343
106
votes
8 answers

What limits the maximum number of connections on a Linux server?

What kernel parameter or other settings control the maximum number of TCP sockets that can be open on a Linux server? What are the tradeoffs of allowing more connections? I noticed while load testing an Apache server with ab that it's pretty easy to…
Ben Williams
  • 2,426
105
votes
5 answers

Configuring Docker to not use the 172.17.0.0 range

Due to problems with captive portals and the default Docker IP range I am trying to make Docker use the 198.18.0.0 range, instead of 172.17.0.0, which clashes with the captive portals used on the trains where I live. Following the docs, I created…
jrtapsell
  • 1,386
105
votes
6 answers

How to get a .pem file from ssh key pair?

I created a key pair using ssh-keygen and get the two clasic id_rsa and id_rsa.pub. I imported the public key into my AWS EC2 account. Now I created a windows instance and to decrypt that instance password, AWS console is asking me for a .pem file.…
user120858
105
votes
6 answers

Why can't MX records point to an IP address?

I understand you should not point a MX record at an IP address directly, but should instead point it to an A record, which, in turns, points to the IP address of your mail server. But, in principle, why is this required?
dayuloli
  • 1,303
105
votes
4 answers

How does ServerName and ServerAlias work?

It's the following part of a virtual host config that I need further clarification on: # Admin email, Server Name (domain name), and any aliases ServerAdmin example@example.com ServerName 141.29.495.999 ServerAlias…
njp
  • 1,152
105
votes
8 answers

Show all users and their groups/vice versa

I know I have existing groups and users but I'm not sure about their association. Is there an shell command I can use to list all users or all groups and a command to list all groups/users for a specified user/group? So something like showusers…
Steve Robbins
  • 2,032
105
votes
2 answers

scp without known_hosts check

Is there any chance to skip the known_hosts check without clearing known_hosts or disable it in ssh.conf? I neither have access to known_hosts nor ssh.conf yet. Don't find any suitable in man.
burnersk
  • 2,186
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