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1500 questions
92
votes
18 answers

Ansible stuck on gathering facts

I'm having some odd issues with my ansible box(vagrant). Everything worked yesterday and my playbook worked fine. Today, ansible hangs on "gathering facts"? Here is the verbose output: <5.xxx.xxx.xxx> ESTABLISH CONNECTION FOR USER:…
Bj Blazkowicz
  • 1,031
92
votes
2 answers

How can I send a message to the systemd journal from the command line?

In older Linux systems, the logger command can be used to send a log message to syslog. Reading where does logger log its messages to in Arch Linux?, it seems that syslog messages and the logger command line app only talk to the systemd journal if a…
mikemaccana
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92
votes
6 answers

Standard place for user defined bash_completion.d scripts?

I have user access (no root) into a Linux (Suse) machine where I developed some bash scripts and the corresponding bash autocompletion rules. Since the scripts belong only to my user and therefore I need the complete rules only "active" for me (a…
Carles Sala
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92
votes
11 answers

Testing UDP port connectivity

I am trying to test whether I can get to a particular port on a remote server (both of which I have access to) through UDP. Both servers are internet facing. I am using netcat to have a certain port listening. I then use nmap to check for that port…
Lock
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92
votes
9 answers

Is there a proper way to clear logs?

I was wondering if there was a proper way to clear logs in general? I'm new to Ubuntu and I'm trying to set up Postfix. The log in question is /var/log/mail.log. I was wondering if there was a correct way to clear it, rather than me going in it and…
mastofact
  • 1,023
91
votes
6 answers

How to determine the hostname from an IP address in a Windows network?

My LAN has 50 Windows hosts. At the Windows command line I try ping to get the IP address of a running Windows machine. The question is how to get hostname of a specific IP address in the same Windows workgroup? Another question is how to know the…
billyduc
  • 1,627
91
votes
8 answers

Best way to disable swap in Linux

I am running a custom compiled 3.18.9 kernel and I am wondering about the best way to disable swap on the system. I also use init if it makes a difference. Is it enough to comment or remove the swap line in /etc/fstab to prevent swap from…
user283167
  • 913
91
votes
4 answers

What is the literal escape character in Powershell?

When including a literal quote character inside a quoted string in Powershell, how do I escape the quote character to indicate it is a literal instead of a string delimeter?
David Alpert
  • 1,625
91
votes
4 answers

Nginx - root versus alias, for serving single files?

After many hours getting nginx to serve single files such as robots.txt (hint: clear your browser cache each time), I wound up with two different ways, one using the alias directive, and one using the root directive, like so: location /robots.txt {…
Cyclops
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91
votes
14 answers

How can I set a short timeout with the ping command?

I am trying to write a script that lists all the hosts on my LAN (there a about 20 of them) and writes the ping status next to each host. I have the DHCP leases file, so I have all the IPs (say, 10.0.0.1, 10.0.0.2, etc.), all I need is the ping…
MiniQuark
  • 4,005
91
votes
6 answers

How do you free up a port being held open by dead process?

A colleague of mine recently ran into a problem where a process that had supposedly died was still bound to a network port, preventing other processes from binding to that port. Specifically, netstat -a -b was reporting that a process named System…
Adam Rosenfield
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91
votes
8 answers

What is "anycast" and how is it helpful?

I'd never heard of anycast until a few seconds ago when I read "What are some cool or useful server/networking tricks?". The wikipedia "Anycast" article on it is quite formal and doesn't really evoke a mental picture of how it would be used. Can…
username
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90
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
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90
votes
3 answers

Multiple TXT fields for same subdomain

I would like to understand if multiple TXT records for the same subdomain are ok or could lead to issues. In particular, we have the requirement for one SPF record and one Google Domain Verification record on the root domain. In AWS Route 53 they…
chrisvdb
  • 1,319
90
votes
5 answers

What is the difference between Nginx variables $host, $http_host, and $server_name?

What is the difference between the three Nginx variables $host, $http_host, and $server_name? I have a rewrite rule where I'm not sure which one I should be using: location = /vb/showthread.php { #…
Jeff Widman
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