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1500 questions
124
votes
7 answers
How to change an EC2 instance's security group
I have created a new EC2 instance. It got assigned the default security group. I want to change that security group. How?
user35042
- 2,761
- 12
- 39
- 62
124
votes
6 answers
Why does x86 represent 32bit when x64 represents 64bit?
My question is why is the shorthand for 32-bit x86 when the shorthand for 64-bit is x64?
I'm guessing it has something to do with the days of 386s and 486s, when the 32-bit processors all ended in 86, but surely there were processors that didn't end…
Simon Foster
- 2,712
124
votes
29 answers
How to copy a large number of files quickly between two servers
I need to transfer a huge amount of mp3s between two serves (Ubuntu).
By huge I mean about a million files which are on average 300K.
I tried with scp but it would have taken about a week. (about 500 KB/s)
If I transfer a single file by HTTP, I get…
nicudotro
- 1,571
124
votes
1 answer
What ports to open for mail server?
I have just finished setting up a Postfix mail server on a linux (ubuntu) platform. I have it sending and receiving email and it is not an open relay. It also supports secure smtp and imap.
Now this is a pretty beginner question but should I be…
radman
- 1,751
123
votes
6 answers
Do you need separate IPv4 and IPv6 listen directives in nginx?
I've seen various config examples for handling dual-stack IPv4 and IPv6 virtual hosts on nginx. Many suggest this pattern:
listen 80;
listen [::]:80 ipv6only=on;
As far as I can see, this achieves exactly the same thing as:
listen [::]:80…
Synchro
- 3,339
- 6
- 30
- 40
122
votes
21 answers
Login without running bash_profile or bashrc
So let's say one typoed something in their .bashrc that prevents him (or her) from logging in via ssh (i.e. the ssh login exits because of the error in the file). Is there any way that person could login without executing it (or .bashrc since the…
Tom Ritter
- 3,377
122
votes
5 answers
Postgres equivalent to MySQL's \G?
Does anyone know if Postgres has a way to display query results "prettily", like how MySQL does when ending a query with \G on the command line? For instance, "select * from sometable\G" as opposed to "select * from sometable;"
Many thanks!
law
- 1,560
122
votes
17 answers
GIT as a backup tool
On a server, install git
cd /
git init
git add .
git commit -a -m "Yes, this is server"
Then get /.git/ to point to a network drive (SAN, NFS, Samba whatever) or different disk. Use a cron job every hour/day etc. to update the changes. The .git…
user80776
122
votes
13 answers
Engineers are using explosives to remove hard rock outside our office building. What countermeasures should we take?
Our building is located approx. 100 meters from the explosive charges. They happen several times per day, and really shake the entire building a lot. This is going to go on for many days and the blasts are supposed to get stronger.
Our server rooms…
Chris Dale
- 1,543
122
votes
10 answers
How to check if I'm in screen session?
I need it to determine if hitting ctrl+d would disconnect me from server or just close current screen.
Is it somehow possible to check if I'm right now in screen session?
wlk
- 1,795
122
votes
9 answers
How can I figure out my LDAP connection string?
We're on a corporate network thats running active directory and we'd like to test out some LDAP stuff (active directory membership provider, actually) and so far, none of us can figure out what our LDAP connection string is. Does anyone know how we…
Allen
- 1,473
121
votes
7 answers
How to set default Ansible username/password for SSH connection?
I am using Ansible and I have this configuration in my inventory/all:
[master]
192.168.1.10 ansible_connection=ssh ansible_ssh_user=vagrant ansible_ssh_pass=vagrant
[slave]
192.168.1.11 ansible_connection=ssh ansible_ssh_user=vagrant…
Robert
- 1,362
121
votes
8 answers
How to install/change locale on Debian?
I've written a web application for which the user interface is in Dutch. I use the system's date and time routines to format date strings in the application. However, the date strings that the system formats are in English but I want them in Dutch,…
Hongli Lai
- 2,332
121
votes
10 answers
Which ports do I need to open in the firewall to use NFS?
I'm running Ubuntu 11.10 - setting up NFS to share a directory among many other servers. Which ports are required to be opened on the firewall?
kenny
- 1,323
121
votes
4 answers
What firewall ports need to be open to allow access to external git repositories?
What firewall port(s) need to be open to allow access to external git repositories?
markdorison
- 1,345
- 2
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- 7