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1500 questions
77
votes
3 answers

IPTables only allow localhost access

I have struggled throughout the years to get a solid understanding on iptables. Any time I try and read through the man pages my eyes start to glaze over. I have a service that I only want to allow the localhost to have access to. What terms (or…
iptablessuck
  • 773
77
votes
3 answers

Listen to UDP data on local port with netcat

netcat -ul -p2115 fails with a usage statement. What am I doing wrong?
Tyler
  • 873
77
votes
1 answer

Capturing STDERR and STDOUT to a file using 'tee'

I'm unclear what the best order is to capture both STDERR and STDOUT to the same file using tee. I know that if I want to pipe to a file I have to map the file handle after the redirect, i.e., find . >/tmp/output.txt 2>&1 This instructs the shell…
PP.
  • 3,606
77
votes
13 answers

ZFS vs XFS

We're considering building a ~16TB storage server. At the moment, we're considering both ZFS and XFS as filesystem. What are the advantages, disadvantages? What do we have to look for? Is there a third, better option?
Mkkt Bkkt
  • 873
77
votes
2 answers

How do I edit the crontab of another user on my linux server?

I have a user on my linux server who has sudo. I want to edit the crontab of another user. I'm new to this though and don't understand what the man pages are telling me yet. Man crontab tells me I can use this format for the crontab…
bflora
  • 909
77
votes
9 answers

Can't seem to disable Java Automatic Update

I'm just tweaking out my new Windows 7 laptop and wanted to disable the automatic Java updating (and thus kill the silly jusched.exe background process), but I can't seem to get it to actually turn it off. I found the Java Control Panel applet and…
Scott Bussinger
  • 1,821
77
votes
6 answers

Sending cron output to a file with a timestamp in its name

I have a crontab like this on a LAMP setup: 0 0 * * * /some/path/to/a/file.php > $HOME/cron.log 2>&1 This writes the output of the file to cron.log. However, when it runs again, it overwrites whatever was previously in the file. How can I get cron…
Philip Morton
  • 893
76
votes
5 answers

Why disable swap on kubernetes

Since Kubernetes 1.8, it seems I need to disable swap on my nodes (or set --fail-swap-on to false). I cannot find the technical reason why Kubernetes insists on the swap being disabled. Is this for performance reasons? Security reasons? Why is the…
Jeroen Jacobs
  • 1,436
76
votes
10 answers

memcache vs memcached?

I want to use memcached http://www.danga.com/memcached/ I have installed it through yum install memcached But now I need to connect to PHP, and there is an extension named memcache and one named memcached?…
thanksyo
  • 839
76
votes
3 answers

Block range of IP Addresses

I am getting bombarded with attempted hacks from China all with similar IPs. How would I block the IP range with something like 116.10.191.* etc. I am running Ubuntu Server 13.10. The current line I am using is: sudo /sbin/iptables -A INPUT -s…
Stephen Cioffi
  • 877
76
votes
8 answers

How to change a SSH host key?

I cloned a server and so they've the same RSA key fingerprint. It seems to be defined in /etc/ssh/ssh_host_rsa_key.pub. What is the correct way to change that? Thanks.
Pascal Polleunus
  • 1,583
76
votes
4 answers

What is the correct syntax to run cron every 4 hours?

I have the following syntax (which I think is correcT?) but it runs the command every minute! * */4 * * * /cmd.sh
erotsppa
  • 2,173
76
votes
4 answers

How to PREPEND rules rather than APPEND using iptables?

Pretty basic question: how to PREPEND rules on IPTABLES rather than to APPEND? I have DROP statements at the bottom of my rules. I have a software to add new rules but adding rules after DROP statements isn't good. Every time I want to add a new…
ale
  • 953
76
votes
3 answers

How to run VBoxManage.exe?

The file is located in Program Files/Oracle/VirtualBox/VBoxManage.exe and is used as a command-line interface with VirtualBox. I'm using it to convert the .vdi image to a .vdmk (for…
AlxVallejo
  • 1,096
76
votes
5 answers

How do I grep through binary files that look like text?

I have binary files that should be text (they're exported logs), but I can't open it with less (it looks ugly - it looks like a binary file). I found that I could open it with vi and I can cat it (you'll see the actual logs), but what I'd really…
Robyn Smith
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