“Linux Crontab 定时任务 命令详解” :http://blog.csdn.net/tianlesoftware/article/details/5315039
Automatically backup on the remote server:
Let’s firstly assumpt:
- You have a site named “ example.com ”;
- You can login to it through a username “ deploy ”, and its password is “ password ”;
- You located the contents of your site in
- Your database server is Mysql , and the database for your site is example_production.
1. SSH login:
2. Install the backup:
3. Prepare directories for backup files:
4. Generate and edit backup script:
Input the below content:
# encoding: utf-8
Backup::Model.new(:example_db, 'Dumping example Production Database') do
database MySQL do |db|
db.name = "example_production"
db.username = "" # Replace the blank string with your real username
db.password = "" # Replace the blank string with your real password
db.host = "localhost"
db.port = 3306
db.socket = "/var/run/mysqld/mysqld.sock"
db.additional_options = ["--quick", "--single-transaction"]
store_with Local do |local|
local.path = "/var/www/example/backup/db"
local.keep = 10
Run backup command to confirm that your config works:
Attention : Remember to update the config file if you have changed the username and/or password of the database.
5. Install whenever:
6. Generate a schedule.rb file with whenever:
The last command will create a new file named “schedule.rb” under
7. Add a daily task:
Open the file to edit:
set :output, "~/Backup/example_whenever.log" # This is important, it can help you to find the reason when failed to backup the database
every :day do
command "cd ~/Backup && backup perform -t example_db"
8. Update whenever task into crontab:
9. Check whether the task is updated successfully or not:
If successed, you should see your new task shown at the bottom of the file.
Synchronize remote backups every day automatically by rsync and crontab:
Attention : Below operations are played on a different server, which is used to sync files. We assumpt its domain is
another.com and the username is
1. SSH login:
2. Write a synchronize shell script:
Input the below contents into the new file named ‘sync.sh’:
and then, assign the scripe execution authority:
Run the script to ensure everything works well:
Attention: Because it is required to be authorized to access the targer server, you should remember to copy your ssh public key to the target server(such as, example.com ) before you can sync files.
3. Open user’s crontab config file:
Append the below task at the end:
Ok, that’s all. The rest work is that remember to check if there is any backups generated.