If let’s say Mysql is slow at performing a task you can check what is the bottleneck using strace to attach to the process.
<span style="color: #00ff00;">$ ps -ef|grep -i mysql</span>
Identify the process id then
<span style="color: #00ff00;">$ strace -cp <pid></span>
Leave it 10 seconds or a minute then ^C. That will tell you where the process is spending its time, e.g. it could just be waiting for the disk if you seen read and write dominate.
Njoy 🙂
So you remote deskptop rebooted and teamviewer did not run on startup as it does not do in Linux for some strange reason:
Connect with ssh ( putty)
Then run
DISPLAY=`localhost`:0 teamviewer&
Njoy 🙂 !
Virtual machines and NTP do not go easily well together. Machines paused for extended periods tend to loose the ntp sync since the difference grows too much.
Also from VMware Docs the following info might be clarificatory:
And :
In ESX, the ESX NTP daemon runs in the service console. Because the service console is partially virtualized, with the VMkernel in direct control of the hardware, NTP running on the service console provides less precise time than in configurations where it runs directly on a host operating system. Therefore, if you are using native synchronization software in your virtual machines, it is somewhat preferable to synchronize them over the network from an NTP server that is running directly on its host kernel, not to the NTP server in the service console. In ESXi, there is no service console and the NTP daemon runs directly on the VMkernel, so it works well as a NTP server for virtual machines.
Quoted from : http://www.vmware.com/files/pdf/techpaper/Timekeeping-In-VirtualMachines.pdf
Easy way (And I think best solution is)
To force a sync run hwclock command.
nJoy 🙂 !
To check if your php installation can successfully send emails from a bash script try this :
php -r ‘var_dump(mail(“david.saliba@testemail.com”, “test subject”, “test body”));’
Thanks Gareth !
nJoy 🙂 !
Suppose the Disk is /dev/sdb, the second scsi disk,
fdisk /dev/sdb
create as many partitions as you need using command n
Label them with command t as 8e for making it Linux LVM
Write and Exit with the command w.
Format the partitions you require using mkfs command
mkfs -t ext3 -c /dev/sdb1
LVM commands
pvcreate /dev/sdb1
vgextend VolGroup00 /dev/sdb1
lvextend -L 15G /dev/VolGroup00/LogVol01 ;for extending LogVol to 15GB
lvextend -L+1G /dev/VolGroup00/LogVol01 ;for adding one more GB to Logical Volume LogVol01
lvextend -l +100%FREE /dev/VolGroup00/LogVol01
Next you shall need to resize the filesystem.
resize2fs -l /dev/VolGroup00/LogVol01
Thats it finished Njoy 🙂 !
php -i | grep -i memcache
Short and sweet
sample output :
memcache
memcache support => enabled
memcache.allow_failover => 1 => 1
memcache.chunk_size => 8192 => 8192
memcache.default_port => 11211 => 11211
memcache.default_timeout_ms => 1000 => 1000
memcache.hash_function => crc32 => crc32
memcache.hash_strategy => standard => standard
memcache.max_failover_attempts => 20 => 20
memcached
memcached support => enabled
libmemcached version => 0.50
Registered save handlers => files user memcache memcached
Njoy 🙂
Sometimes you know passwords but are not ion a position to use shared keys. Solution is using expect to pass the password from a script read or a comman line parameter.
** NOTE Passwords in command lines are a really bad idea since you can see them in the history / ps -ef so best is to read from stdio and pass as a parameter.
#!/usr/bin/expect
spawn scp [lindex $argv 0] root@192.168.8.117:/vmfs/volumes/datastore1/
######################
expect {
-re "Password:" {
exp_send "[lindex $argv 1]\r"
}
}
interact
When running:
svn checkout https://mysvn.mydomain.com:8443/svn/Linux/trunk/scripts/ –username *** –password ‘****’
I got :
WARNING: gnome-keyring:: couldn’t connect to: /tmp/keyring-fTq763/pkcs11: No such file or directory
Password for ‘default’ GNOME keyring: *****
svn: OPTIONS of ‘https://mysvn.mydomain.com:8443/svn/Linux/trunk/scripts’: authorization failed: Could not authenticate to server: rejected Basic challenge (mysvn.mydomain.com:8443)
Problem could be damaged keyring or wrong keyring password.
To fix quickly :
pkill keyring
re-run the checkout.
Voila ! you get a new keyring and the process works. Checkout goes through.
Njoy 🙂
p.s.
As a desparate measure :
mv /usr/bin/mate-keyring-daemon /usr/bin/mate-keyring-daemon.rubbish
From bash it’s easy to snap a photo from the webcam.
mplayer -vo png -frames 1 tv://
That’s it.. Njoy 🙂
This is the simple case where all we have is one disk that needs cloning.
Assumptions for the following example
Points to perform :
An extra help might be connecting to the target box in a target session and run iftop to see the transfers.