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1500 questions
132
votes
2 answers
Colors in bash after piping through less?
When I have dircolors defined life is full of... color.
When I pipe ls through less to scroll around I lose the colors.
Any suggestions?
MathewC
- 7,147
131
votes
44 answers
Cheat Sheets for System Administrators?
I'd like to start a collection of good, free cheat sheet resources for system administrators. Please add your favorite ones. From the Wikipedia "cheat sheet" article:
In more general usage, a "cheat sheet"
is any short (one or two page)
…
splattne
- 28,776
131
votes
14 answers
Why is RAID not a backup?
When someone mentions RAID in a conversation about backups, invariably someone declares that "RAID is not a backup."
Sure, for striping, that's true. But what's the difference between redundancy and a backup?
jldugger
- 14,602
131
votes
6 answers
Postfix - how to retry delivery of mail in queue?
I have a backup mail server in case of a failure on the main one.
In that case of failure, mails come on the backup server and stay there until the main one is back.
If I wait some times, the delivery will be done automatically as soon as the main…
Nicolas
- 1,319
- 2
- 8
- 3
130
votes
15 answers
How to show all banned IP with fail2ban?
When I run this command fail2ban-client status sshd I got this:
Status for the jail: sshd
|- Filter
| |- Currently failed: 1
| |- Total failed: 81
| `- File list: /var/log/auth.log
`- Actions
|- Currently banned: 2
|- Total…
Dark Cyber
- 1,409
130
votes
7 answers
How do I list loaded Linux module parameter values?
Is there a standard way to list the parameter values of a loaded Linux module? I'm essentially probing for another answer to this Linux kernel module parameters question, because the module I'm interested in doesn't have a…
cdleary
- 1,885
130
votes
6 answers
Turn off pager for psql's interactive output
We switched from PostgreSQL 8.3 to 9.0. Perhaps it's a new feature or perhaps just a configuration change, but now when output from commands (like, \d tablename) exceeds visible vertical space, psql seem to pipe the output through something similar…
Yuri Ushakov
- 1,433
130
votes
4 answers
How can I see Time-To-Live (TTL) for a DNS record?
I would like to see the Time-To-Live (TTL) value for a CNAME record.
I have access to dig (on Apple Mac OS X), which gives me an answer like this:
% dig host.example.gov
<*SNIP*>
;; ANSWER SECTION:
host.example.gov. 43200 IN CNAME …
Stefan Lasiewski
- 24,361
- 42
- 136
- 188
129
votes
11 answers
FreeBSD: Directory called ^C (really!) - how to remove?
I made a typo:
$ history
169 9:34 la /usr/local/etc/
170 9:35 sudo mkdir ^C
171 9:36 sudo mkdir /usr/local/etc/dnsmasq.d
Now I have a file that is called ^C (ctrl+C)!!
When I use ls I just see a questionmark (probably due to the locale?)
%…
Mausy5043
- 1,367
129
votes
4 answers
How to disable timeout for nginx?
On a local development machine, I have a nginx reverse proxy like so:
server {
listen 80;
server_name myvirtualhost1.local;
location / {
proxy_pass http://127.0.0.1:8080;
}
server {
listen 80;
server_name myvirtualhost2.local;
…
k0pernikus
- 4,730
129
votes
2 answers
How does try_files work?
I looked at the nginx documentation and it still confuses me utterly.
How does try_files work? Here is what the documentation says:
From NginxHttpCoreModule
try_files
syntax: try_files path1 [path2] uri
default: none
context: server,…
user274
129
votes
4 answers
Amazon EC2 terminology - AMI vs. EBS vs. Snapshot vs. Volume
I have been poking around Amazon EC2, and am a little confused on some of the terminology. Specifically with regard to AMI, snapshots and volumes, and an EBS
Please correct me if I am wrong, or fill in any serious gaps in my following…
Matt
- 3,271
129
votes
8 answers
How can I kill all stopped jobs?
When I try to exit from my Linux server I get the message:
There are stopped jobs.
: Is there a single command to kill these?
yazz.com
- 7,953
129
votes
8 answers
How to get pid of just started process
I want to start process (eg. myCommand) and get its pid (to allow to kill it later).
I tried ps and filter by name, but I can not distinguish process by names
myCommand
ps ux | awk '// {print $2}'
Because processes names are not…
rafalmag
- 1,401
128
votes
4 answers
How do I auto-start docker containers at system boot?
What is a good way to automatically start docker containers when the system boots up?
Is there a preferred way to do this on Ubuntu 14.04?
I've used supervisord in the past to auto start web apps. But that doesn't feel like the right thing for…
Stefan Arentz
- 1,390