clsung is reading -

2017-10-26

[GCP] Create disk from snapshot of another project

Step 0: create snapshot from desired disk, example name: disk-snapshot-20171026

Step 1: copy the selfLink from snapshot’s equivalent REST response: projects/another-project/global/snapshots/disk-snapshot-20171026

Note: One can get the link via the following command:

gcloud compute snapshots list --project=another-project --uri

1	gcloud compute snapshots list --project=another-project --uri

Step 2: execute the following command (replace current-project and asia-east1-a with your own project and zone, respectively)

gcloud compute disks create disk1 --project=current-project \
  --source-snapshot=projects/another-project/global/snapshots/disk-snapshot-20171026 \
  --zone=asia-east1-a

gcloud compute disks create disk1 --project=current-project \

--source-snapshot=projects/another-project/global/snapshots/disk-snapshot-20171026 \

--zone=asia-east1-a

2017-05-14

[docker] Multi-stage builds

Consider the following scenario: you are going to rolling update your cluster, and it turns out your network bandwidth is limited for some reason and size of built docker image is not small enough. What’s worse, every instance of cluster will need to pull the docker image before start-up… Read More

2017-04-18

CoreOS remove early-docker since 1284.0.0

It happens the docker daemon wasn’t alive when I login to the console.

Container Linux by CoreOS beta (1353.4.0)
Failed Units: 2
  docker.service
  docker.socket

$ sudo systemctl start docker.service
Failed to start docker.service: Unit early-docker.target not found.

$ grep -ri 'early-docker.target'
system/docker.service:After=docker.socket early-docker.target network.target
system/docker.service:Requires=docker.socket early-docker.target

Container Linux by CoreOS beta (1353.4.0)

Failed Units: 2

docker.service

docker.socket

$ sudo systemctl start docker.service

Failed to start docker.service: Unit early-docker.target not found.

$ grep -ri 'early-docker.target'

system/docker.service:After=docker.socket early-docker.target network.target

system/docker.service:Requires=docker.socket early-docker.target

After review the release document, it seems early-docker.target should be remove in all related target.

Ref: CoreOS Release 1284.0

2016-08-25

Update salt from 2015.5.3 to 2016.3.2

When reading salt’s source code, it seems we have a ‘source_hash_update’ option on “archive.extracted”, however when I added so, salt complains:

    Warnings: 'source_hash_update', 'group' and 'user' are invalid keyword
              arguments for 'archive.extracted'. If you were trying to pass
              additional data to be used in a template context, please populate
              'context' with 'key: value' pairs. Your approach will work until
              Salt Carbon is out. Please update your state files.

Warnings: 'source_hash_update', 'group' and 'user' are invalid keyword

arguments for 'archive.extracted'. If you were trying to pass

additional data to be used in a template context, please populate

'context' with 'key: value' pairs. Your approach will work until

Salt Carbon is out. Please update your state files.

2016-08-15

Developing with consul on Macbook

For development use, we need to have consul running on localhost. When using a Macbook (Air), we need to specify the “-bind=0.0.0.0” and “-client=0.0.0.0” in order to have programs (tests) access to the consul agent in the container: Read More

2016-08-03

重整 Exif 資料

多想幾天，可以不用重新發明輪子。 :p
Read More

2014-08-14

Install docker on Centos 7

Perform a yum search docker, we can see two docker available:

docker.x86_64 : Automates deployment of containerized applications
docker-io.x86_64 : Automates deployment of containerized applications

Well, at least for today, the docker.x86_64, which is mentioned in , is still 0.11. So please install the docker-io.x86_64, which is 1.0.0-1.el7.

Updated 20140829: there’s more up-to-date repo for docker.

Updated 20150111: it seems the repo is out of managed now. And official repo is upgraded to 1.3.2. Thus the official repo is recommended now.

% # just use original one
% # curl -O https://copr.fedoraproject.org/coprs/goldmann/docker-io/repo/epel-7/goldmann-docker-io-epel-7.repo
% # sudo mv goldmann-docker-io-epel-7.repo
% # yum update
% # yum install docker-io
% sudo service docker start
Redirecting to /bin/systemctl start docker.service

2014-08-14

EPEL 7 for Centos 7

To install EPEL-7

% rpm -ivh http://dl.fedoraproject.org/pub/epel/beta/7/x86_64/epel-release-7-0.2.noarch.rpm

1	% rpm -ivh http://dl.fedoraproject.org/pub/epel/beta/7/x86_64/epel-release-7-0.2.noarch.rpm

Also, enable it by default, edit /etc/yum.repos.d/remi.repo and set ‘enable=1’ under section of [remi] and [remi-

2013-11-05

Install GNU gcc 4.8.2 on CentOS 6.4

Install pre-requirements:

 % yum install gmp-devel mpfr-devel  libmpc-devel

1	% yum install gmp-devel mpfr-devel libmpc-devel

Download and extract gcc 4.8.2 source tar ball:

 % curl -O ftp://ftp.gnu.org/gnu/gcc/gcc-4.8.2/gcc-4.8.2.tar.gz; tar zxf gcc-4.8.2.tar.gz

1	% curl -O ftp://ftp.gnu.org/gnu/gcc/gcc-4.8.2/gcc-4.8.2.tar.gz; tar zxf gcc-4.8.2.tar.gz

 % cd gcc-4.8.2; ./configure --enable-languages=c,c++ --disable-multilib

1	% cd gcc-4.8.2; ./configure --enable-languages=c,c++ --disable-multilib

Build and install:

 % make; make install<

2013-10-04

Crop image in golang

In python, for cropping image I use PIL. However the dependencies of PIL is huge, also need to install some lib*-dev packages.

So I choose go to crop images:

Usage:

% go run crop.go large.jpeg thumbna