https://www.twiceweb.net/board/view/ent_bangtan/30
Wednesday, August 29, 2018
How to set up MySQL max connections
This shows current max connections for mysql.
mysql> show variables like 'max_connections';
This shows current used connections for now.
mysql> show status like 'Max_used_connections';
To check how many connections were aborted. If you see aborted connection, you might need to increase max connection settings.
mysql> show status like 'Aborted%';
To change max connections:
mysql> set global max_connections=300;
If you want permanent settings:
# vi /etc/my.cnf
[mysqld]
max_connections = 300
You need to restart to make the change of /etc/my.cnf to be effective.
service mysqld restart
and check it again:
mysql> show variables like 'max_connections';
https://www.twiceweb.net/board/view/software/12
how to use crontab [linux]
* listing current crontab:
crontab -l
* editing crontab:
crontab -e
* example (once every 1st day of month):
0 0 1 * * shell_command_here
* special strings:
string meaning
------ -------
@reboot Run once, at startup.
@yearly Run once a year, "0 0 1 1 *".
@annually (same as @yearly)
@monthly Run once a month, "0 0 1 * *".
@weekly Run once a week, "0 0 * * 0".
@daily Run once a day, "0 0 * * *".
@midnight (same as @daily)
@hourly Run once an hour, "0 * * * *".
------ -------
@reboot Run once, at startup.
@yearly Run once a year, "0 0 1 1 *".
@annually (same as @yearly)
@monthly Run once a month, "0 0 1 * *".
@weekly Run once a week, "0 0 * * 0".
@daily Run once a day, "0 0 * * *".
@midnight (same as @daily)
@hourly Run once an hour, "0 * * * *".
https://www.twiceweb.net/board/view/software/8
Vultr Tokyo sysbench performance benchmark result
vultr performance test result (Tokyo region)
1 vCPU@2.4GHz
1GB RAM
25GB SSD
1TB traffic
$5/month
sysbench CPU test : 298 events/s
sysbench memory : 2850MB/s
sysbench file I/O :
read: 21.77MB/s
write: 14.51MB/s
sysbench mysql
read-only : 455 transactions/s, 7289 queries/s
read-write : 149 transactions/s, 2988 queries/s
write-only : 280.89 transactions/s, 1685 queries/s
how to redirect HTTP to HTTPS on nginx
sudo vi /etc/nginx/sites-available/SITEDOMAIN
server {
listen 80 default_server;
listen [::]:80 default_server;
server_name _;
return 301 https://$host$request_uri;
}
The first listen statement is for HTTP port of IPv4.
The second listen statement if for HTTP port of IPv6.
You can redirect from specific domain name as following:
server_name example.com www.example.com
https://www.twiceweb.net/board/view/computer/22
how to check disk space usage or free disk space on Ubuntu
$ df -h
the result:
Filesystem Size Used Avail Use% Mounted on
udev 464M 0 464M 0% /dev
tmpfs 99M 664K 98M 1% /run
/dev/vda1 25G 4.9G 19G 21% /
udev 464M 0 464M 0% /dev
tmpfs 99M 664K 98M 1% /run
/dev/vda1 25G 4.9G 19G 21% /
https://www.twiceweb.net/board/view/computer/20
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