echo -e “o\nn\np\n1\n\n\nw” | fdisk /dev/sda
or
(echo o; echo n; echo p; echo 1; echo ; echo; echo w) | sudo fdisk
fdisk auto partitioning
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Monthly Archives: July 2014
extract single mysql database
mysql -D db_name-o < add_mysql_dump.sql
gunzip set answer to: do you wish to overwrite
yes y | gunzip archive.gz
rate-limiting in rsyslog
imuxsock begins to drop messages from pid XXXXX due to rate-limiting
vi /etc/rsyslog.conf
SystemLogRateLimitInterval 0
SystemLogRateLimitBurst 0
bash ip to hex
printf '%02X' 192 168 0 128 ; echo
Its useful:
IP=192.168.0.129
IP=${IP//./ }
printf '%02X' $IP; echo
python Ip to hex
ipython
a = ‘192.168.0.100’.split(‘.’)
‘{:02X}{:02X}{:02X}{:02X}’.format(*map(int, a))
CXX compiler: “CMAKE_CXX_COMPILER-NOTFOUND” was not found
yum install gcc-c++
yum install cmake
centos 7 epel
yum install http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-2.noarch.rpm
python web server
cd some_folder/
python -m SimpleHTTPServer 7878
7878 is HTTP port
create LVM volumes for KVM servers
You need describe your LVM volume group in XML format:
vgs
vi /etc/libvirt/storage/vg_server1.xml
virsh pool-define /etc/libvirt/storage/vg_server1.xml
virsh pool-start vg1
virsh pool-autostart vg1
virsh pool-info vg1
now use virt-instal:
virt-install -d --hvm --vnc --name=server1 --ram 5000 --disk pool=vg1,size=100,bus=virtio,cache=none --network network=default,model=virtio \
--location=http://mirror.duomenucentras.lt/centos/7/os/x86_64/ \
--os-type=linux
improve ext4 file system
tune2fs -o journal_data_writeback /dev/partinio_name
vi /etc/fstab
/dev/partinio_name /home ext4 noatime,data=writeback,barrier=0,nobh,errors=remount-ro
Where data=writeback means that metadata for files can be written lazily after the file is written. That not cause file system corruption, but it may cause the most recent changes to be lost in the event of a crash.
Cloudlinux – Library files “too short”
If you have this error for some users: php error while loading shared libraries: libpcre.so.0: cannot open shared object file: No such file or directory
Fix.
yum check
yum reinstall alt-pcre
cPanel – Account does not exist
If you are trying to change mailbox password and you get “Account does not exist”. It means your account can be over quota, please try temporally increase account size. Also sometime helps this fix:
cd ~username/.cpanel
mv -v email_accounts.yaml email_accounts.yaml.backup
cPanel install memcahe Centos 7
yum install memcached
service memcached start or maybe: systemctl start memcached.service
pecl install memcache
systemctl restart httpd.service
If you want install from source:
wget http://pecl.php.net/get/memcache
cd memcache*
phpize
./configure
make && make install
echo “extension=memcache.so” >> /your_path/php.ini
log all mysql queries
If you want log all your MySQL queries:
vi /etc/my.cnf
log = log_file_name