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1500 questions
104
votes
2 answers

How can I connect to a Windows server using a Command Line Interface? (CLI)

Especially with the option to install Server Core in Server 2008 and above, connecting to Windows servers over a CLI is increasingly useful ability, if not one that's very widespread amongst Windows administrators. Practically every Windows GUI…
HopelessN00b
  • 53,954
104
votes
6 answers

High load average, low CPU usage - why?

We're seeing huge performance problems on a web application and we're trying to find the bottleneck. I am not a sysadmin so there is some stuff I don't quite get. Some basic investigation shows the CPU to be idle, lots of memory to be available,…
Spiff
  • 1,651
104
votes
7 answers

SSH from A through B to C, using private key on B

I'm looking for a simple way to SSH from my local machine, A, through a proxy, B, to a destination host, C. The private key that goes with the public key on C is on B, and I can't put that key on my local machine. Any tips? Also, I'd like to be…
wrangler
  • 3,170
104
votes
7 answers

Is there a way to do a remote "ls" much like "scp" does a remote copy?

Is there a way to do a remote "ls" much like "scp" does a remote copy in a standard linux shell?
yazz.com
  • 7,483
104
votes
4 answers

How to reload screenrc without restarting screen?

After modified screenrc, how to see the changes without restarting screen?
garconcn
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104
votes
11 answers

How to zip/unzip files in Powershell?

Is there a one-liner that will zip/unzip files (*.zip) in PowerShell?
BlueGene
  • 2,231
103
votes
2 answers

IPTABLES - Limit rate of a specific incoming IP

I do not wish to limit the rate of a specific service. My goals is to limit rate based solely on the incoming IP address. For example using a pseudo-rule: john.domain.local (192.168.1.100) can only download from our httpd/ftp servers at "10KB/s"…
James
  • 1,117
103
votes
11 answers

Cooling Server Closet - No A/C Is Possible

We're moving into a new office in an old building in London (that's England :) and are walling off a 2m x 1.3m area where the router & telephone equipment currently terminates to use as a server closet. The closet will contain: 2 24-port switches…
JamesCo
  • 993
103
votes
3 answers

Perform rsync while following sym links

I have a directory that contains symbolic links to other directories located on different media on my system: /opt/lun1/2011 /opt/lun1/2010 /opt/lun2/2009 /opt/lun2/2008 /opt/lun3/2007 But the symbolic links show up…
ensnare
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103
votes
6 answers

Tips for Securing a LAMP Server

This is a Canonical Question about Securing a LAMP stack What are the absolute guidelines for securing a LAMP server?
Aditya Shukla
  • 1,031
103
votes
6 answers

Adding a directory to $PATH in CentOS?

We just got our new server(s) up and we're running CentOS on them all. After successfully installing Ruby Enterprise Edition, I would now like to add the REE /bin (located at /usr/lib/ruby-enterprise/bin) directory to make it the default Ruby…
vonconrad
  • 1,281
102
votes
6 answers

What range of MAC addresses can I safely use for my virtual machines?

I want to assign my virtual machines MAC addresses so that I can configure DHCP reservations for them so that they always get the same IP address regardless of which host hypervisor they are running on or operating system they are running. What I…
Chris Magnuson
  • 3,831
102
votes
8 answers

Can you have more than one ~/.ssh/config file?

We have a bastion server that we use to connect to multiple hosts, and our .ssh/config has grown to over a thousand lines (we have hundreds of hosts that we connect to). This is beginning to get a little unwieldy and I'd like to know if there is a…
wrangler
  • 3,170
102
votes
9 answers

How to add a security group to a running EC2 Instance?

I have an Amazon EC2 instance running and I will like to add another security group to that instance and then remove the current security group from that instance. Is this possible?
Geo
  • 3,081
102
votes
2 answers

I have a keypair. How do I determine the key length?

Using OpenSSL from the command line in Linux, is there some way to examine a key (either public or private) to determine the key size?
jdw
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