Schlagwort: Computer

Set system time via ntpdate // get rid of daemons!

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I don’t like to have daemons listening on the systems I am responsible for. This is the reason why I check periodically all systems with netstat -tulpen to see what processes are actually listening, look if they are needed and may be bound to localhost only.

I used to set the system time via ntpd, but many years ago I switched to a simple cron job that runs ntpdate. This is good enough for all systems that don’t depend on milliseconds and smooth time shift etc. I was able to remove ntpd from almost all servers. My cron job looks like this:

## ntpdate Cron Job
 
# Environment Settings
MAILTO=root
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
 
# Job Definition
*/30 * * * *  root  /usr/sbin/ntpdate 0.pool.ntp.org > /tmp/ntpdate.prt 2>&1

MySQL – Show open connections and processes

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Einmal an die eigene Notizwand gekritzelt:

  1. MySQL Verbindungen + weitere Verbindungsrelevante Infos anzeigen: 
    root@localhost [(none)]> show status like '%onn%';
+--------------------------+--------+
| Variable_name            | Value  |
+--------------------------+--------+
| Aborted_connects         | 0      |
| Connections              | 440921 |
| Max_used_connections     | 67     |
| Ssl_client_connects      | 0      |
| Ssl_connect_renegotiates | 0      |
| Ssl_finished_connects    | 0      |
| Threads_connected        | 2      |
+--------------------------+--------+
7 rows in set (0.00 sec)
  2. MySQL Prozessliste anzeigen: 
    root@localhost [(none)]> show processlist;
+--------+-------+-----------+-------+---------+------+-------+------------------+
| Id     | User  | Host      | db    | Command | Time | State | Info             |
+--------+-------+-----------+-------+---------+------+-------+------------------+
| 440912 | ttrss | localhost | ttrss | Sleep   |    0 |       | NULL             |
| 440919 | root  | localhost | NULL  | Query   |    0 | NULL  | show processlist |
+--------+-------+-----------+-------+---------+------+-------+------------------+
2 rows in set (0.00 sec)
  3. Der status Parameter der mysqladmin Binary auf der Kommandozeile: 
    root@host ~ $ mysqladmin status
Uptime: 1621495  Threads: 2  Questions: 18982236  Slow queries: 6  Opens: 83474  Flush tables: 1  Open tables: 400  Queries per second avg: 11.706
  4. Und last but not least auch noch einmal die Prompt-Einstellung aus der /etc/mysql/my.cnf festgehalten: 
    [mysql]
prompt = \u@\h [\d]>\_

Die MySQL Befehle habe ich von dieser Webseite kopiert. Die Prompt Einstellungen weiß ich nicht mehr woher…