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1500 questions
80
votes
11 answers
Multiple data centers and HTTP traffic: DNS Round Robin is the ONLY way to assure instant fail-over?
Multiple A records pointing to the same domain seem to be used almost exclusively to implement DNS Round Robin as a cheap load balancing technique.
The usual warning against DNS RR is that it is not good for high availability. When 1 IP goes down…
Valentino Miazzo
- 1,113
80
votes
6 answers
How to test if my server is vulnerable to the ShellShock bug?
How can I ensure my Bash installation is not vulnerable to the ShellShock bug anymore after the updates?
anon
80
votes
2 answers
Tried to create 2 record set type=TXT in Route53
I'm trying to add a second TXT record to a domain, but I get the following error:
Tried to create resource record set type='TXT but it already exists
Can I add two records at the same domain?
gpupo
- 1,344
80
votes
6 answers
What is the correct way to open a range of ports in iptables
I have come across articles advising for the following:
iptables -A INPUT -p tcp 1000:2000 -j ACCEPT
And others stating that the above will not work and iptables only supports multiple port declarations with the --multiport option.
Is there a…
Paul Whalley
- 823
80
votes
9 answers
Enable HTTP Strict Transport Security (HSTS) in IIS 7
What is the best way to turn on HTTP Strict Transport Security on an IIS 7 web server?
Can I just through the GUI and add the proper HTTP response header or should I be using appcmd and if so what switches?
Bob
- 2,599
80
votes
4 answers
How to keep the full path with rsync?
When backing up with rsync, How do I keep the full directory structure?
For example, the remote server is saturn, and I want to backup saturn's /home/udi/files/pictures to a local directory named backup.
I want to have (locally)…
Adam Matan
- 14,084
80
votes
6 answers
How to redirect domain A to domain B using A-Records and CNAME records only
I have 2 domains hosted with different hosts. I need to redirect Domain A to Domain B. Unfortunately I can't do a 301 redirect from Host A, but can only modify/add DNS entries (A-Records and CNAMEs) at Host A.
Surely it is possible to redirect…
Prembo
- 987
80
votes
4 answers
How to make wireshark filter POST-requests only?
How to make wireshark filter POST-requests only?
Ilya Smagin
- 903
80
votes
10 answers
Can't find .so in the same directory as the executable?
I have an executable which needs to link with libtest.so dynamically,so I put them in the same directory,then :
cd path_to_dir
./binary
But got this:
error while loading shared libraries: libtest.so: cannot open shared object file: No such file or…
linuxer
- 803
- 1
- 6
- 4
80
votes
13 answers
How Often Do Windows Servers Need to be Restarted?
A little background: We have several Windows servers (2003, 2008) for our department. We're a division of IT so we manage our own servers. Of the four of us here I'm the only one with a slight amount of IT knowledge. (Note the "slight amount".) My…
Evan
- 919
80
votes
5 answers
In Linux, what is the difference between "buffers" and "cache" reported by the free command?
This is an old question that I've seen from time to time. My understanding of it is rather limited (having read about the differences a long time ago, but the factoid(s) involved never really stuck).
As I understand it,
Buffers
Are used by…
Avery Payne
- 14,804
79
votes
6 answers
Generating a self-signed cert with openssl that works in Chrome 58
As of Chrome 58 it no longer accepts self-signed certs that rely on Common Name: https://productforums.google.com/forum/#!topic/chrome/zVo3M8CgKzQ;context-place=topicsearchin/chrome/category$3ACanary%7Csort:relevance%7Cspell:false
Instead it…
bcardarella
- 1,757
79
votes
5 answers
What is the difference between SAN, NAS and DAS?
What is the difference between SAN, NAS and DAS?
sevugarajan
79
votes
3 answers
What does -qq argument for apt-get mean?
I just received a Vagrantfile and post install bash script. The vagrantfile downloads standard Ubuntu from Ubuntu Cloud but I found something in the bash script.
Few lines of script reads as:
apt-get update -qq > /dev/null
apt-get -qq -y install…
user156477
79
votes
14 answers
Docker containers can't resolve DNS on Ubuntu 14.04 Desktop Host
I'm running into a problem with my Docker containers on Ubuntu 14.04 LTS.
Docker worked fine for two days, and then suddenly I lost all network connectivity inside my containers. The error output below initially lead me to believe it was because…
Thomas V.
- 2,141