Greatest Hits

16
votes
3answers
111k views

For Loop counting from 1 to n in a windows bat script

I need to run a windows command n times within a bat script file. I know how to do this in various programming languages but cannot manage to get it right on the windows command line :-( I would ...
12
votes
2answers
18k views

How can I upgrade to Java 1.8 on an Amazon Linux Server?

I tried sudo yum update but it just keeps java "1.7.0_75". I need 1.8 for it to work with another application but can't figure out how to upgrade it. Do I need to manually install it somehow? There's ...
27
votes
7answers
97k views

What is the recommended size for a Linux /boot partition?

What is the recommended size for a Linux /boot partition? And is it safe to not have a /boot partition? I see some servers don't have a /boot partition while some servers have a 128 MB /boot ...
11
votes
4answers
43k views

No mysqld or mysql.server after mariadb-server install

So... likely I'm an idiot, but I'm stuck. I just set up a CentOS 7 on Digial Ocean and I can't seem to get the MariaDB/MySQL server running. Some output [root@hostname ~]# yum list installed |grep ...
13
votes
3answers
52k views

RSA certificate configured for SERVER does NOT include an ID which matches the server name

I recently started a LAMP server (all the latest versions) w/ WordPress on it, and I'm trying to install a SSL certificate that I recently purchased. When I restart apachectl, error_log gives me this: ...
23
votes
5answers
107k views

How do I install an rpm that complains about rpmlib(FileDigests) <= 4.6.0-1?

Im trying to install an rpm file on CentOS 5 and Im not sure how to resolve this issues it brings up: $ rpm --install epel-release-6-5.noarch.rpm warning: epel-release-6-5.noarch.rpm: Header V3 ...
39
votes
9answers
73k views

How do I get apt-get to ignore some dependencies?

How do I make apt-get ignore some dependencies? For example, I wanted to install mailx so I can use it to send email from cron scripts/report-generating tools. However, installing mailx also installs ...
33
votes
4answers
67k views

how do you create an ssh key for another user?

I'm trying to create an ssh key for another user. I'm logged in as root. Can I just edit the files generated by ssh-keygen and change root to the user I want?
19
votes
11answers
101k views

How do I find out which devices are on a network?

How do I scan a network to find out which devices are on it? (I'd be happy with a list of MAC addresses and IPs.) For example, lets say I'm at work and want to be sure that there are no unknown ...
74
votes
2answers
91k views

How do I add Access-Control-Allow-Origin in NGINX?

How do I set the Access-Control-Allow-Origin header so I can use web-fonts from my subdomain on my main domain? Notes: You'll find examples of this and other headers for most HTTP servers in the ...
93
28
votes
4answers
86k views

How can I query my system via command line to see if a KB patch is installed?

I'm looking to find out if a KB is installed via command line.
53
votes
4answers
60k views

How do I load a sql.gz file to my database? (importing)

I'm trying to import a gzipped SQL file into mysql directly. Is this the right way? mysql -uroot -ppassword mydb > myfile.sql.gz
29
votes
4answers
154k views

How to enable MySQL logging?

I am running MySQL 5.0.45 on OS X 10.6.1 and I cannot get MySQL to log anything. I am debugging an application and need to see all queries and errors. I added to the etc/my.cnf: [mysqld] ...
19
votes
3answers
82k views

How do I clear Chrome's SSL cache?

I have a HAProxy / stunnel server that handles SSL for our sites on AWS. During testing, I created a self-signed cert on this server and hit it from my desktop using Chrome to test that stunnel was ...
271
votes
27answers
61k views

100% uptime for a web application

We received an interesting "requirement" from a client today. They want 100% uptime with off-site failover on a web application. From our web application's viewpoint, this isn't an issue. It was ...
18
votes
5answers
44k views

Connecting to MySQL from PHP is extremely slow

I just did a fresh install of XAMPP. When first opening PHPMyAdmin I noticed it was extremely slow. It didn't make sense that on localhost it should take almost 5 seconds for every page to open. I ...
22
votes
5answers
100k views

How to install Active Directory Users and Computers for Windows 2008

I want to install the administration tools on a Windows Server 2008 (R1) machine. On Windows 2003 you installed adminpak.msi, but I can't find such a file for 2008. Is this a "feature" in Server ...
5
votes
2answers
53k views

How to completely wipe WSUS and start again

Anyone know of a way to completely wipe WSUS of updates and start again? It seems as if I have loads of language packs and assorted rubbish in the list which we do not need. Having now removed all ...
93
39
votes
3answers
20k views

How can I check /dev/xvda1?

On login to EC2 (Ubuntu) instance, I see *** /dev/xvda1 should be checked for errors *** I can't fsck /dev/xvda1 because it is mounted, and sudo umount /dev/xvda1 fails because it is in use. lsof ...
13
votes
12answers
108k views

Windows command prompt: how to get the count of all files in current directory?

What command would you use in cmd.exe to find the number of files in the current directory? Is there a powershell option here? Update: I was hoping to avoid dir, as I know there are 10,000+ files in ...
89
votes
4answers
80k views

how to disable SSH login with password for some users?

On Linux (Debian Squeeze) I would like to disable SSH login using password to some users (selected group or all users except root). But I do not want to disable login using certificate for them. ...
14
votes
3answers
72k views

How do i find out what my IP Address of my MySQL host is?

I have a free domain running at x10hosting (x10.bz), and I want to find out the IP Address of my MySQL host for it, so I can contact the MySQL database from another host. I've already added that host ...
107
32
votes
1answer
77k views

How do I change the privileges for MySQL user that is already created?

I understand how to create a new user with privileges, but what is the correct way to change privileges for users that are already created? We are running a DB audit and some of the users have way ...
103
43
votes
10answers
104k views

Running a cron job manually and immediately

(I have already read How can I test a new cron script ?.) I have a specific problem (cron job doesn't appear to run, or run properly), but the issue is general: I'd like to debug scripts that are ...
7
votes
4answers
106k views

How to restore/import an Oracle database from dmp file?

I've recently recieved the dump file of the soon to be migrated Oracle Database. I've installed Oracle 10g and now i need to restore the original database. Can anyone give me a step to step ...
189
votes
9answers
29k views

Heartbleed: What is it and what are options to mitigate it?

This is a Canonical Question about understanding and remediating the Heartbleed security issue. What exactly is CVE-2014-0160 AKA "Heartbleed"? What is the cause, what OSs and versions of OpenSSL ...
15
votes
4answers
28k views

500 error on fresh install of IIS and PHP

When attempting to run a PHP file on Windows server 2012 and IIS, I keep getting a 500 error. I cannot find any detailed logs or anything. However, when going to PHP Manager for IIS and click check ...
88
55
votes
8answers
84k views

How can I monitor hard disk load on linux

Is there a good command line utility to monitor hard disk load on linux? Something like top but then monitoring disk activity i.s.o. cpu usage. More specifically, I suspect that for some (heavy load) ...
21
votes
8answers
95k views

Nginx + php-fpm “504 Gateway Time-out” error with almost zero load (on a test-server)

After debugging for 6-hours - I am giving this up :| We have a nginx+php-fpm+mysql in LAN with almost 100 wordpress (created and used by different designers/developers all working on test wordpres ...
23
votes
4answers
58k views

Unknown/unsupported storage engine: InnoDB | MySQL Ubuntu

I recently upgraded from the previous LTS Ubuntu to Precise and now mysql refuses to start. It complains of the following when I attempt to start it: ╰$ sudo service mysql restart stop: Unknown ...
40
votes
4answers
139k views

Is it possible to change an “Unidentified Network” into a “Home” or “Work” network on Windows 7

I have a problem with Windows 7 RC (7100). I frequently use a crossover network cable on WinXP with static IP addresses to connect to various industrial devices (e.g. robots, pumps, valves or even ...
8
votes
11answers
73k views

Exchange 2010 and Outlook 2010 requesting password every time it starts

I have one Exchange 2010 server which is fully updated, the clients are running Outlook 2010 but some users are getting a prompt for credentials every time they open Outlook. I have checked for ...
22
votes
4answers
101k views

What's the maximum number of wifi connections for a single WiFi router?

We've got a Draytek 2829VN Wifi router and I'm wondering how many concurrent connections I should expect a router of this kind to cope with? We are looking to connect 60 iPads! I'd also be ...
23
votes
3answers
60k views

MySQL lowering wait_timeout value to lower number of open connections

I run a rather busy site, and during peek hours I see over 10.000 open connections to my database server on my webserver when a run a netstat command. 99% of the connections are in the TIME_WAIT ...
8
votes
4answers
113k views

How to check if hardware RAID is configured?

I have several servers running Windows 2008 and Red Hat 5 that are capable of hardware RAID. How do I check that hardware RAID is configured?
3
votes
3answers
33k views

Renewing SBS2011 Exchange Self-Signed Certificate w/o changing home page in IE?

On a previous server when we used the built in SBS wizard to renew the certificate it worked, however it reset all of the computers on the domain's IE home page to companyweb. Is there a way to do ...
34
votes
4answers
136k views

How to filter http traffic in Wireshark?

I suspect my server has a huge load of http requests from its clients. I want to measure the volume of http traffic. How can I do it with Wireshark? Or probably there is an alternative solution using ...
67
votes
11answers
71k views

apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName

I keep getting this warning when I (re)start Apache. * Restarting web server apache2 apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ...
122
votes
12answers
126k views

How to set up Nginx as a caching reverse proxy?

I heard recently that Nginx has added caching to its reverse proxy feature. I looked around but couldn't find much info about it. I want to set up Nginx as a caching reverse proxy in front of ...
8
votes
1answer
58k views

Deploying VM from vmdk / vmx file

I have a vmdk file and vmx file (and all the other files from someone elses datastore) copied onto my own data store. If I try to deploy from the vmx file, I get a vm with the name "unknown # ...
51
votes
3answers
71k views

How to override/update a symlink?

I am trying to use symbolic links. I did some reading and found the following commands: Creation -> ln -s {/path/to/file-name} {link-name} Update -> ln -sfn {/path/to/file-name} {link-name} ...
57
votes
6answers
67k views

When does /tmp get cleared?

I'm taking to putting various files in /tmp, and I wondered what the rules on deleting them are? I'm imagining it's different for different distributions, and I'm particularly interested in Ubuntu ...
103
votes
1answer
74k views

What is a challenge password?

I'm setting up SSL on an Ubuntu server. One of fields it asks for as part of setting up the CSR is a "challenge password". What is that? The default is blank. Do I need to enter one?
87
45
votes
5answers
16k views

On a dual CPU server, is it normal for one CPU to run hotter than the other?

I have a dual Opteron server running Linux with libvirt to host several VMs. The VMs work fine and the server processes OK, but I notice one CPU always runs about 69C (throttles at 70C) and the other ...
28
votes
5answers
60k views

how to restart/clear memcache without restarting the whole web server?

/opt/eduserver/eduserver gives me options: Usage: /opt/eduserver/eduserver ...
15
votes
5answers
84k views

How do I determine what my DHCP server is?

I have a sad network left behind by some careless admins - I am in process of figuring out exactly what services are running where, not excluding the possibility that some services are running from ...
22
votes
3answers
81k views

How to stream live video from a linux server?

Here is what I want to do. Looked around but didnt find any straight answer. I have a Linux box running websites using Ubuntu/MySQL/Apache. I have my own static IP as well, i.e. not using web hosting. ...
20
votes
3answers
11k views

IBus >= 1.5.11 on Ubuntu

I'm running Ubuntu 15.04. I have the newest version of IBus installed, so does the command show: apt-get changelog ibus But the software I use (PHPStorm 10) gives a warning that IBus with version ...
11
votes
5answers
83k views

How do I configure proxy settings for LOCAL SYSTEM?

If I edit Proxy Settings through the Control Panel, the settings are stored in HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ProxyEnable and ...\ProxyServer. These ...
20
votes
13answers
70k views

How to get a list of drive letters on a system through a windows shell (bat, cmd)?

How do I get a list of drive letters and their associated labels on a windows system through a bat file?