| """ | |
| Example code for resetting the USB port that a Teensy microcontroller is | |
| attached to. There are a lot of situations where a Teensy or Arduino can | |
| end up in a bad state and need resetting, this code is useful for | |
| """ | |
| import os | |
| import fcntl | |
| import subprocess |
On Tue Oct 27, 2015, history.state.gov began buckling under load, intermittently issuing 500 errors. Nginx's error log was sprinkled with the following errors:
2015/10/27 21:48:36 [crit] 2475#0: accept4() failed (24: Too many open files) 2015/10/27 21:48:36 [alert] 2475#0: *7163915 socket() failed (24: Too many open files) while connecting to upstream...
An article at http://www.cyberciti.biz/faq/linux-unix-nginx-too-many-open-files/ provided directions that mostly worked. Below are the steps we followed. The steps that diverged from the article's directions are marked with an *.
su to run ulimit on the nginx account, use ps aux | grep nginx to locate nginx's process IDs. Then query each process's file handle limits using cat /proc/pid/limits (where pid is the process id retrieved from ps). (Note: sudo may be necessary on your system for the cat command here, depending on your system.)fs.file-max = 70000 to /etc/sysctl.conf
Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.
$ python -m SimpleHTTPServer 8000
| git branch -m old_branch new_branch # Rename branch locally | |
| git push origin :old_branch # Delete the old branch | |
| git push --set-upstream origin new_branch # Push the new branch, set local branch to track the new remote |
| # | |
| #Example of how to use EasyMDB RS232 | |
| #Date June/2014 | |
| #Version 1.0.2 | |
| #Not warranty, for educational purposes | |
| #Thinkchip | |
| #V1.0.1 | |
| #dispense coin function | |
| #Level coin changer added |
mybaby:~ brainv$ ssh -v 192.168.255.69
OpenSSH_6.7p1 Debian-5, OpenSSL 1.0.1k 8 Jan 2015
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to 192.168.255.69 [192.168.255.69] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_rsa type -1
| var crypto = require('crypto'); | |
| var key = 'MySecretKey12345'; | |
| var iv = '1234567890123456'; | |
| var cipher = crypto.createCipheriv('aes-128-cbc', key, iv); | |
| var decipher = crypto.createDecipheriv('aes-128-cbc', key, iv); | |
| var text = 'plain text'; | |
| var encrypted = cipher.update(text, 'utf8', 'binary'); | |
| encrypted += cipher.final('binary'); | |
| hexVal = new Buffer(encrypted, 'binary'); |
| # /tmp/test = EBS-SSD | |
| # /mnt/test = instance-store | |
| root@ip-10-0-2-6:~# dd bs=1M count=256 if=/dev/zero of=/tmp/test | |
| 256+0 records in | |
| 256+0 records out | |
| 268435456 bytes (268 MB) copied, 3.26957 s, 82.1 MB/s | |
| root@ip-10-0-2-6:~# dd bs=1M count=256 if=/dev/zero of=/tmp/test | |
| 256+0 records in | |
| 256+0 records out |
| <?php | |
| /** | |
| * Password Strength Helper | |
| * @packages Helpers | |
| */ | |
| /** | |
| * Password Rules | |
| * | |
| * Check password for complexity and length requirements | |
| * |