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Kevin Mershon

DbSettings - 0 views

www.h2database.com/...DbSettings.html

grails gorm postgresql h2 column identifier case sensitive sensitivity join joinTable

shared by Kevin Mershon on 12 Apr 12 - No Cached
  • databaseToUpper Database setting DATABASE_TO_UPPER (default: true). Database short names are converted to uppercase for the DATABASE() function, and in the CATALOG column of all database meta data methods. Setting this to "false" is experimental. When set to false, all identifier names (table names, column names) are case sensitive (except aggregate, built-in functions, data types, and keywords).
  • Kevin Mershon on 12 Apr 12
     
    "Database setting DATABASE_TO_UPPER (default: true). Database short names are converted to uppercase for the DATABASE() function, and in the CATALOG column of all database meta data methods. Setting this to "false" is experimental. When set to false, all identifier names (table names, column names) are case sensitive (except aggregate, built-in functions, data types, and keywords)."
Kevin Mershon

Re: [monit] Monit 5.0.2 question - 0 views

www.mail-archive.com/...msg02793.html

monit hostname host hosts $HOST wrong set centos localhost.localdomain

shared by Kevin Mershon on 12 Apr 12 - No Cached
  • The problem is that there is no reliable way how to get correct FQDN. There is unreliable interface getdomainname() which returns on many platforms empty string or often default domains like "localdomain", "mydomain" when no other specific domain was set during system installation. The getdomainname() takes the value on some platforms from sysctl, on other platforms from file in /etc/ and on other platforms it's completely ignored. The name service lookup is not reliable as well - it depends on how the name service was set (usually NSS switch uses local files first which often have the shortname in front of longname for the given IP address and thus return often shortname first).
  • set mailserver foo.bar.baz using hostname "my.monit.host"
Kevin Mershon

Installing XenServer Tools on Ubuntu 10.04 - 0 views

www.jansipke.nl/enserver-tools-on-ubuntu-10-04

XenServer Ubuntu 10.04 paravirtualization mode PV XenTools

shared by Kevin Mershon on 12 Apr 12 - Cached
  • Create a VM from the Other install media template
  • Attach the Ubuntu 10.04 ISO to the DVD drive of the VM
  • Start the VM
  • ...19 more annotations...
  • At the disk partitioning stage make sure to replace Ext4 with Ext3, or create a specific boot partition with Ext3
  • Select at least the OpenSSH server package to be able to log in to the VM remotely
  • Finish installation and boot the VM
  • Connect to the VM using SSH
  • sudo cp /etc/init/tty1.conf /etc/init/hvc0.conf sudo vi /etc/init/hvc0.conf
  • Replace all occurrences of tty1 with hvc0
  • Read /boot/grub/grub.cfg
  • Copy the contents of menuentry near the bottom to a temporary text file, to be used as input for the makepv.sh script that we will use later on menuentry 'Ubuntu, with Linux 2.6.32-21-server' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod ext2 set root='(hd0,1)' search --no-floppy --fs-uuid --set 02899ea9-1876-4e7b-8ef8-2b09b598cedb linux /boot/vmlinuz-2.6.32-21-server root=UUID=02899ea9-1876-4e7b-8ef8-2b09b598cedb ro quiet initrd /boot/initrd.img-2.6.32-21-server }
  • Make special note of /boot/vmlinuz…, root=UUID=… and /boot/initrd.img…
  • Shutdown the VM
  • Connect to the XenServer host with SSH
  • Run the makepv.sh script, replacing my-vm-name with the actual name of your VM
  • Boot the VM and log in with SSH
  • In XenCenter, attach xs-tools.iso to the DVD drive of the VM
  • sudo mount /dev/cdrom1 /mnt sudo dpkg -i /mnt/Linux/xe-guest-utilities_5.5.0-466_amd64.deb sudo umount /mnt
  • In XenCenter, detach xs-tools.iso from the DVD drive of the VM (this ensures that XenServer does not complain about too many bootable devices)
  • Reboot the VM and log in with SSH
  • sudo update-rc.d -f xe-linux-distribution remove sudo update-rc.d xe-linux-distribution defaults
  • Reboot the VM for the last time
Kevin Mershon

Tips for XenServer Stability - 0 views

forums.citrix.com/thread.jspa

XenServer Citrix NTP Clock

shared by Kevin Mershon on 12 Apr 12 - No Cached
  • There's a timeout parameter used by NTP that if things get out of sync by too much, it won't sync them at all.
  • The default is something low, I think just 128 msec, which is pretty small under some circumstances.
  • edit the /etc/sysconfig/ntpd on the control VM to sync hardware. Default is no. Once done, please cycle ntpd. You will see an extra line for hardware clock. If possible, all VMs and XenServer should use a local physical time server.
    • Kevin Mershon
      Kevin Mershon on 12 Apr 12
       
      Changing the system clock settings does not seem to have had any effect on the server's behavior.
  • ...1 more annotation...
  • if you have 4 VCPUs assigned to a guest, the guest would need to wait until 4 cores (physical) are free before it can access the CPU directly
Kevin Mershon

Citrix Forums : Can't adjust VM memory using command ... - 0 views

forums.citrix.com/thread.jspa

xenserver vm change memory static command line xe

shared by Kevin Mershon on 12 Apr 12 - No Cached
  • xe vm-memory-limits-set uuid=xxx static-min=137438953472 dynamic-min=137438953472 dynamic-max=137438953472 static-max=137438953472
Kevin Mershon

XenServer: HowTo Convert HVM to PV (RHEL/SuSE) - 0 views

linuxnet.ch/...onvert_HVM_to_PV_RHELSuSE.html

xen xenserver pv bootloader hvm switch between

shared by Kevin Mershon on 12 Apr 12 - No Cached
  • HVM-boot-policy=BIOS order
  • xe vm-param-set uuid=<vm uuid> PV-bootloader=pygrub
Kevin Mershon

Firewall blocking NFS even though ports are open - 0 views

www.linuxquestions.org/...n-though-ports-are-open-294069

nfs port firewall iptables blocked opensuse centos linux

shared by Kevin Mershon on 12 Apr 12 - No Cached
  • 1. Create the file "/etc/sysconfig/nfs" and add the following contents: STATD_PORT=4001 LOCKD_TCPPORT=4002 LOCKD_UDPPORT=4002 MOUNTD_PORT=4003 2. Append the following to the file "/etc/services": rquotad 4004/tcp # rpc.rquotad tcp port rquotad 4004/udp # rpc.rquotad udp port 3. Restart the nfs services:
  • Open up the following ports (tcp and udp) on the Fedora firewall. Do this either using the "Security Level" app in "System Settings" or using the command line iptables command (think it's in /sbin/): 111:tcp, 111:udp, 2049:tcp, 2049:udp, 4001:tcp, 4001:udp, 4002:tcp, 4002:udp, 4003:tcp, 4003:udp, 4004:tcp, 4004:udp
  • edit Code: /etc/sysconfig/nfs uncomment the default ports: Code: LOCKD_TCPPORT=32803 LOCKD_UDPPORT=32769 MOUNTD_PORT=892 STATD_PORT=662 Add those ports to your firewall rules: edit Code: /etc/sysconfig/iptables Code: # NFS -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 111 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 111 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 662 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 662 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 892 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 892 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 2049 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 2049 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 32803 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 32803 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 32769 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 32769 -j ACCEPT Restart the services: Code: /etc/init.d/iptables restart /etc/init.d/nfs restart /etc/init.d/nfslock restart
Kevin Mershon

Linux Static IP Configuration - Linode Library - 0 views

library.linode.com/...nfiguring-static-ip-interfaces

opensuse set route gateway default

shared by Kevin Mershon on 12 Apr 12 - No Cached
  • Create the following file if necessary: File: /etc/sysconfig/network/routes # Destination Gateway Netmask Device 66.246.75.0 0.0.0.0 255.255.255.0 eth0
  • 0.0.0.0 12.34.56.1 0.0.0.0 eth0
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