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How to Improve rsync Performance

I need to transfer 10TB of data from one machine to another machine. Those 10TB of files are living in a large RAID which span across 7 different disks. The target machine has another large RAID which span across 12 different disks. It is not easy to copying those files locally. Therefore, I decide to […]

Replacing IP Address in Apache2 config files with SED

Suppose i just mirrored my vps machine (starting from a clone and then rsync-ing all needed files) with rsync. Obviously i need to change the IP Address value contained into all the config files, but I’m lazy. So, let’s use “SED” to do it at once, with a single line command. I need to replace […]

rsync

There are many commands to copy a directory in Linux. The difference between them in current Linux distribution are very small. All of them support link, time, ownership and sparse.

I tested them to copy a Linux kernel source tree. Each command I tested twice and keep the lower result. The original directory size is […]

Migrating to Amazon Linux 2

AWS also announced that Amazon Linux 2018.03 is the last release for the current generation of Amazon Linux and will be supported until June 30, 2020. Therefore, you have to come up with a migration plan.

Amazon Linux 2 comes with the same benefits as Amazon Linux, but it adds some new capabilities:

long-term support: […]

mysql dump issue utf8_unicode_520_ci

i use this in linux :

sed -i ‘s/utf8mb4/utf8/g’ your_file.sql sed -i ‘s/utf8_unicode_ci/utf8_general_ci/g’ your_file.sql sed -i ‘s/utf8_unicode_520_ci/utf8_general_ci/g’ your_file.sql

then restore your_file.sql

mysql -uyourdbuser -pyourdbpasswd yourdb < your_file.sql […]

Install LDAP-slapd.conf mode

Install LDAP-slapd.conf mode ——————start installation——————— Query whether to install

# rpm -qa openldap-servers

Remove ldap # yum remove openldap

# yum remove openldap-servers

Installation Environment Centos7 Apache/2.4.6 (CentOS) PHP 7.1.11

Install LDAP Server

Openldap-servers-2.4.44-5.el7.x86_64

# yum install openldap-servers openldap-clients migrationtools

# rpm -qa | grep openldap

Delete all files in the slapd.d folder and copy […]