Kelvin's tech-box (Page 4)

Kelvin's tech-box

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LUN iSCSI Config on Ubuntu

I setup a NAS at home, and I can attach a LUN iSCSI disk from NAS to the ubuntu laptop. After made some tryings, I got this work. Install the iscsi package $ sudo apt-get install open-iscsi Edit the config $ sudo vi /etc/iscsi/iscsid.conf line 53: uncomment node.session.

steps to work with the OpenStack instance via ssh

$ eval `ssh-agent -s`ssh-add` nova delete dev-trusty nova boot dev-trusty --flavor cpu4-ram8-disk50-ephemeral20 --image ddf5bd01-4926-40e3-a4c3-83a73f45554a --key_name kelvin_lcy02 nova add-secgroup dev-trusty custom-ssh nova show dev-trusty nova floating-ip-create nova floating-ip-list nova floating-ip-associate dev-trusty 162.2xx.x.xxx Find which version of the app installed on ubunut apt-cache policy ansible HOW to

What does 2>&1 mean in linux shell

In a unix shell, if I want to combine stderr and stdout into the stdout stream for further manipulation, I can append the following on the end of my command: 2>&1 File descriptor 1 is the standard output (stdout). File descriptor 2 is the standard error (stderr)

Setup the vagrant as dev environment

$ sudo adduser kelvin copy the ssh keys copy the public key to ~/.ssh/authorized_keys change the ssh.username to kelvin bzr lp-login kelvin.li add the user to sudo $ sudo adduser <username> sudo $ sudo vim /etc/sudoers add kelvin ALL=(ALL) NOPASSWD: ALL Remove Existing User from

Useful shell

check the keyword in response header $ curl -vvvsH "Host: software-center.ubuntu.com" -H "Accept-Encoding: gzip" http://91.189.89.82/api/2.0/applications/en/ubuntu/precise/i386/ 2>&1 > /dev/null | grep 'ETag\|X-Cache\|Content-Length\|Content-Type' kill the pid of

IRC client IRSSI setup

I use IRC on remote server more and more frequently, in case I need to config this in the future, the regarding setup steps are consolidated here. Install $ sudo apt install irssi Start by: screen irssi Hilight Window Put the script in ~/.irssi/scripts/autorun/ and type /run autorun/hilightwin.

Ubuntu 增加Swap的空间

新安装了ubuntu，但是忘记了规划swap分区。或者swap分区太小，想要增大些，其实这些任务在linux下都是十分简单和方便实现的。新增分区使用一个文件来实现此功能。 1. 建立一个img文件，大小为512M，需要1024的话就把count=500000改成1000000，这样我们才能访问它。 dd if=/dev/zero of=swap.img bs=1024 count=500000 2. 进行格式化 mkswap swap.img 3. 当然是激活它，使它可用。 sudo swapon swap.img 增大分区 1. 首先用命令free查看系统内 Swap 分区大小。 free -m total used free shared buffers cached Mem:

Ubuntu installation on MacBookPro

Brightness controls doesn't work on a MacBook Pro 5.5 (ubuntu 12.04 LTS) if you want the nvidia driver, type in the terminal sudo apt-get install nvidia-current. After installing the driver, you'll need to enable brightness controls in /etc/X11/xorg.conf. In /etc/X11/

How to create Ubuntu startup disk on Mac

1. Create dmg file from iso hdiutil convert -format UDRW -o /tmp/ubuntu-14.04.1-server-amd64.img /Users/kelvin/Downloads/ubuntu-14.04.1-server-amd64.iso 2. amount the disk diskutil unmountDisk /dev/disk2 3. copy the disk sudo dd if=/tmp/ubuntu-14.04.1-server-amd64.img.dmg of=/dev/rdisk2 bs=1m 4.

git tips

How to create git repository on server $ git init -bare —shared test.git $ git update-server-info Create tag # Annotated Tags $ git tag -a v1.4 -m 'my version 1.4' # Lightweight Tags $ git tag v1.4-lw Sharing Tags git push origin --tags Check out Tags $ git checkout -b version2