Sometimes we need run some commands automatic when system boot up.
We can put the command or script into /etc/rc.local
like:vi /etc/rc.local
add command line into filemount --bind /var/www/html/ /home/ftpuser
This will mount web base dir to ftp base dir automatic when system startup.
And don’t forget to give rc.local execute permission.chmod +x /etc/rc.local
like windows has scheduled tasks.linux has crontab.
it’s a tool for excute tasks on time.
how to install crontab?we can use yum.yum install vixie-cron crontabs
then run itservice crond start
we can add it into autostart when we open the computer.chkconfig --level 345 crond on
how to use crontab
run following command to start crontab edit mode.crontab -e
crontabs’ format
Example of job definition:
.---------------- minute (0 - 59)
| .------------- hour (0 - 23)
| | .---------- day of month (1 - 31)
| | | .------- month (1 - 12) OR jan,feb,mar,apr …
| | | | .---- day of week (0 - 6) (Sunday=0 or 7) or sun,mon,tue,wed,thu,fri,sat
| | | | |
* * * * * user-name command to be executedIn addition to numbers, there are several special symbols that are “*” ,”/” and “-“.
“*” representing all the numbers in the range of values,”/”representing each meaning,”*/5″representing every five units,”-“representing from a number to a number, and”,”separating several discrete numbers.
for example:30 2 * * * sh xx.sh run “sh xx.sh” on 2:30am everyday.*/10 * * * 1-5 sh xx.sh from Monday to Friday, run task every ten minutes.0 17 1,5 * * sh xx.sh every month,on the first and fifth day,when 17:00pm,run the task.
we can use crontab -l to check the scheduled tasks.
what is lamp? lamp is linux+apache+mysql+php.They are all open source software and free.
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo_bakwget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repoyum makecache
yum -y updateyum install httpdwget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpmyum localinstall mysql-community-release-el7-5.noarch.rpmyum repolist enabled | grep "mysql.*-community.*"
yum install mysql-community-serversystemctl start mysqld or service mysqld startmysqladmin -u root password "xxxxxxxx"
rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpmrpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpmyum install php72w php72w-cli php72w-common php72w-devel php72w-embedded php72w-fpm php72w-gd php72w-mbstring php72w-mysqlnd php72w-opcache php72w-pdo php72w-xmlvi /var/www/html/index.php<?php
echo phpinfo();
?>
if you can’t open the page.maybe it denied by firewall.
runfirewall-cmd --zone=public --add-port=80/tcp --permanent
if you want access mysql from other computer.also needfirewall-cmd --zone=public --add-port=3306/tcp --permanentfirewall-cmd --zone=public --add-port=3306/udp --permanent
thenfirewall-cmd --reload
after I lock ftp user to stop them access system dir.
some user get an error when they login.
500 OOPS: vsftpd: refusing to run with writable root inside chroot ()
because if the user is limited to his home directory,the user’s home directory can no longer have write privileges.If the check finds that there are wirte permissions, the error will be reported.
if we need write privileges for home directory.we can modify the vsftpd.conf file.
add following parameter.
allow_writeable_chroot=YES
save and restart vsftpd.
when I build this site.I need ftp to upload web files to the server space.And the upgrade of wordpress also need ftp.
I found it dangerous if the ftp user can access “/” directory. I want to lock them to each ftp root dir. So that I can protect my linux system dir.
There’s a way.
vi /etc/vsftpd/vsftpd.conf
modify following parameters
chroot_local_user=YES chroot_list_enable=NO # YES=no lock，user can access other dir. not safe chroot_list_file=/etc/vsftpd/chroot_list
save the modify and restart vsftpd.It’s work now.
this site is used to share some technology or funs of computer.
like the first program of any code language.
I want to say~
Hello World! 🙂
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