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The new features of ext4 over ext3 motivated me to migrate my ext3 partitions to the new file system. If you want to do the same, here’s the steps yo have to follow. Converting from ext3 to ext4 Note: The following commands must be run on not mounted partitions. If you are planning to convert […] In the traditional disk partitioning scheme, administrators plan ahead the use of each partition. For instance, a laptop with 120 GB hard drive, 1 GB RAM can have the following partition scheme: 1 GB for swap (/dev/sda1), 12 GB for root (/dev/sda2), 107 GB for /home (/dev/sda3), meaning, the remaining space. So far so […] View the currently running jobs:jobs Place running foreground process into background:ctl-z #puts the job to sleepbg %1 Bring a background job into the foreground:fg %1 Kill a job:kill %1kill %1 -9 Find the PID of all jobsjobs -pjobs -pl Bring a nohuped process to the foreground# note: I think you can only do this from […] List available Ciphers: openssl ciphers -v openssl ciphers -v tls1 #only TLS ciphers openssl list-cypher-commands openssl ciphers -v ‘HIGH’ #only good ciphers Test OpenSSL Speed: openssl speed openssl speed rsa #test only rsa Generate self-signed cert: openssl req \ -x509 -nodes -days 365 \ -newkey rsa:1024 -keyout mycert.pem -out mycert.pem OR openssl req […] To create ssh keys:ssh-keygen -t dsa -d 2048Optionally leave the passphrase blankThis will create a ~/.ssh/id_dsa and ~/.ssh/id_dsa.pub file. Check for validity:ssh-keygen -l -f ~/.ssh/id_dsa.pub Copy the key to the remote server:cat ~/.ssh/id_dsa ssh remote_host ‘sh -c “cat – >>~/.ssh/authorized_keys”‘ Convert commercial (SECSH) ssh private / public key to OpenSSHssh-keygen -i -f id_dsa.pub > id_dsa_openssh.pub […] Generates key pair:gpg –gen-key Lists public and private current keys:gpg –list-keysgpg –list-secret-keys Exports public key / private key:gpg –armor –export jaz@example.comgpg –export-secret-key –armor “jaz@example.com” > private.key Imports a public key / private key:gpg –import joe.cagpg –allow-secret-key-import –import private.key Delete public / private key:gpg –delete-key “jaz@example.com”gpg –delete-secret-key “jaz@example.com” Encrypt a document with someone’s public key:gpg –output […] Dependencies needed:Kernel module (version 2.6.9+):Device Drivers > Multi-device support (RAID and LVM) > Device Mapper Support (CONFIG_BLK_DEV_DM)Associated kernel module:dm_mod Package:lvm2 – lvm toolslibdevmapper Show LVM version:lvm version Create the physical disks:pvcreate /dev/hdapvcreate /dev/hdbpvcreate /dev/hdc1pvcreate /dev/hdc2 Show allocated Physical volumes:pvscanpvdisplaylvm pvs Setup a volume group:vgcreate vg_name /dev/hda /dev/hdb /dev/hdc1 /dev/hdc2 Display a volume group:vgdisplaylvm vgs […] Environment: CentOS 6.2 64bit with multipath connected to HP EVA storage, the LUN disk was LVM disk Objective: add a new LUN disk for server online and add into the existing LVM to make the partition size bigger scenario: LVM add new lun disk, increase the existing lvm lun disk, increase the existing partition disk […] Add a new disk This assumes you have created an array on the SAN and allocated space to a logical volume on it; you have mapped a LUN pointing that logical volume to that host, and that the host is correctly zoned to see the SAN in the fibre channel fabric. Before anything, run multipath […] Contents Introduction Create Logical Volumes Delete Logical Volumes Introduction The following article presents an overview of the commands used to manage physical and logical volumes for use with Logical Volume Manager (LVM) in Linux. Before considering the various commands for LVM, lets first look at just what is meant by some of the terminology […] |
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