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The Crucial Blog - Archive August 17, 2008
Xen Bug: xen_net: Memory squeeze in netback driver (32bit PAE)If you are receiving the following error in your logs while running a 32bit PAE Xen Kernel:
Then you need to do the following: 1. In your grub.conf (or other bootloader) set the Dom0 to a fixed size: dom0_mem=1024. 2. In /etc/xen/xend-config.sxp set dom0-min-mem to the same size as above. 3. Reboot Basically what you are doing is ensuring that Dom0 will not be decreased in size, as when this happens it causes problems the the xen_net driver which can in turn cause network connectivity problems with your DomUs. Tags: hypervm, server-administration, vds, xenRelated postsNo Comments Filed under: Uncategorized by — aaron @ 10:10 pm June 5, 2008
How to upgrade Gentoo (emerge)The basic way to upgrade Gentoo, is the following: # emere –sync Once this has been competed: # emerge -uDv world Tags: gentoo, linux, server-administrationRelated postsNo Comments Filed under: Uncategorized by — aaron @ 10:06 pm April 2, 2008
yum errror: error: install: %pre scriptlet failed (2), skipping …Problem: If you are getting an error something like this when using yum: Total download size: 549 k Solution: Disable selinux Tags: server-administration, xen, yumRelated postsNo Comments Filed under: Uncategorized by — aaron @ 6:02 am April 1, 2008
Xen DomU: 4gb seg fixup, processA common error on a Xen DomU (as well as Dom0) in /var/log/messages once the guest/VDS has just been setup is: 4gb seg fixup, process You can fix this easily by doing the following on the guest/VDS: mv /lib/tls /lib/tls.disabled Related postsNo Comments Filed under: Uncategorized by — aaron @ 2:12 am March 31, 2008
LVM: pvcreate /dev/sda4 gives error Device /dev/sda4 not found (or ignored by filtering).If you are using the pvcreate command something like this: pvcreate /dev/sda4 And it gives an error like this: Device /dev/sda4 not found (or ignored by filtering). This can sometimes be resolved by rebooting the server (if the LVM partition was just created, and the server has not yet been rebooted). Tags: server-administration, serversRelated postsNo Comments Filed under: Uncategorized by — aaron @ 6:38 pm March 19, 2008
HyperVM: VM creation has failed. Reason: Could not download __path_program_ or no_template_and_could_not_download []HyperVM with Xen Error when trying to rebuild a VDS, or when trying to setup a new VDS:
Or
Solutions: Tags: hypervm, server-administration, vds, virtual dedicated servers, xen Related postsNo Comments Filed under: Uncategorized by — aaron @ 10:12 pm March 18, 2008
FreeBSD Installation Issues/Problems Error: BTX haltedWhen you receive the following error:
This error can occur when installing via a USB CD-ROM drive, or if you have a USB hard drive. The solution to this is to unplug them, and install without using that device. Tags: freebsd, server-administrationRelated postsNo Comments Filed under: Uncategorized by — aaron @ 1:56 am March 16, 2008
Spamd child process causing high server loadSometimes, spamd child process for a particular user can cause high server load. This is a bug with spamassassin and is reported here: https://issues.apache.org/SpamAssassin/show_bug.cgi?id=5612 To fix the issue, apply the patch mentioned in the bug. For cPanel servers, run the following scripts: /scripts/autorepair spamd_dbm_fix Related postsNo Comments Filed under: Uncategorized by — aaron @ 2:59 pm March 5, 2008
404 Error when to accessing /wp-admin/admin-ajax.phpWhen you receive this error:ForbiddenYou don’t have permission to access /wp-admin/admin-ajax.php on this server. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request. If you are receiving this error, then its likely you have mod_security installed on your server, and you will need to update your mod_security rules. Find the following in your mod_security configuration:
Change it to:
If you don’t have access to mod_security configuration (i.e. you are not the administrator of the server), then you can add the following to a .htaccess file for your site: Tags: blog, cpanel, security, server-administration, wordpress Related postsNo Comments Filed under: Uncategorized by — aaron @ 4:56 pm March 5, 2008
Server hung at ‘Probing PCI hardware bus (00)’Error: Probing PCI hardware bus (00), server hung at this message, while booting. The problem can be fixed by adding the kernel flag ‘pci=nommconf’ in the kernel command line in the grub. 1) Reboot the server. 2) At the grub boot screen, select the kernel and press ‘e’ to edit the entry. 3) Select the kernel command line and press ‘e’ to edit the entry, which looks like kernel /vmlinuz-x.x.x-x.x ro root=/dev/abc/ acpi=off 4) Add pci=nommconf at the end of the line, like kernel /vmlinuz-x.x.x-x.x ro root=/dev/abc/ acpi=off pci=nommconf 5) Then press enter and press ‘b’ to boot. Once the server reboots and comes online, edit the grub.conf and add ‘pci=nommconf’ in the default kernel’s kernel command line. (kernel /vmlinuz-x.x.x-x.x ro root=/dev/abc/ acpi=off pci=nommconf) Tags: acpi, server-administrationRelated postsNo Comments Filed under: Uncategorized by — aaron @ 2:53 pm |
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