Create new file and add the next lines inside (for example pushtogit.sh)
#!/bin/bash echo " ====================== running command from" $PWD cd $PWD git add . echo -n " ====================== commit message: " read message git commit -m "$message" git push -u origin master echo " ====================== done..." |
Save the changes and add the alias inside .bashrc
alias pushtogit="/home/USER/PATH/pushtogit.sh" |
Some PHP packages may stop working after update with error message: “There is no suitable CSPRNG installed on your system”.
The reason for this that they stopped using OpenSSL and now they need access to /dev/urandom which isn’t readable by your PHP configuration.
To fix this problem, all you need to do is to add /dev/urandom to your open_base configuration which limits the files that can be accessed by PHP to the specified directory-tree (or trees).
In case you’re using php-fpm, add the “/dev/urandom” in existing php_admin_value[open_basedir] definition (or add this line if it doesn’t exist)
For example:
php_admin_value[open_basedir] = /var/www/html/domain.tld:/usr/share/php5:/usr/share/php:/tmp:/usr/share/phpmyadmin:/etc/phpmyadmin:/var/lib/phpmyadmin:/dev/random:/dev/urandom |
or if you’re using mod_fcgi, inside .php-fcgi-starter script add parameter
-d open_basedir="/var/www/html/domain.tld:....:/dev/urandom" |
If you’ve just installed CentOS 6.x on software RAID and it won’t boot from /dev/md0, don’t worry. It can be fixed.
– Insert CentOS media/DVD and boot in rescue mode (select “Rescue mode” during boot)
– Select the “start shell” option
– chroot with
chroot /mnt/sysimage |
– install GRUB into /dev/md0 with
grub-install /dev/md0 |
– enter exit and than reboot
The other option is to enter into rescue mode and inside grub shell type the next commands:
grub> device (hd0) /dev/sda grub> device (hd1) /dev/sdb grub> root (hd0,0) grub> setup (hd0) grub> root (hd1,0) grub> setup (hd1) grub> quit |
To change your hostname, you’ll need to edit /etc/hostname file with
sudo nano /etc/hostname |
The file content is very simple. It contains the current hostname and all you need to do is to replace it with the new one, save and exit
After you save the changes, open /etc/hosts file and replace the current hostname with the new one near 127.0.1.1 IP address.
Change
... 127.0.1.1 old-hostname ... |
into
... 127.0.1.1 new-hostname ... |
Save file and exit.
Now, enter the next command
sudo hostname new-hostname |
Your computer’s hostname will be changed immediately. (The change won’t appear in the terminal until you reopen it again)
This method will work on all Debian based distros (Ubuntu, Kubuntu, ….)
If you’re not sure which components are installed in your server/pc, you can use inxi which is a command line system information script. It will show you the system hardware, CPU, drivers, Xorg, Desktop, Kernel, GCC version(s), Processes, RAM usage, and a wide variety of other useful information.
For example:
myPC@myPC ~ $ inxi -F
System: Host: myPC Kernel: 3.19.0-32-generic x86_64 (64 bit) Desktop: Cinnamon 2.8.8
Distro: Linux Mint 17.3 Rosa
Machine: System: LENOVO product: 20E1000BSC v: ThinkPad W550s
Mobo: LENOVO model: 20E1000BSC v: SDK0E50510 WIN Bios: LENOVO v: N11ET34W (1.10 ) date: 08/20/2015
CPU: Dual core Intel Core i7-5600U (-HT-MCP-) cache: 4096 KB
clock speeds: max: 3200 MHz 1: 901 MHz 2: 981 MHz 3: 2195 MHz 4: 2199 MHz
Graphics: Card-1: Intel Broadwell-U Integrated Graphics
Card-2: NVIDIA GM108GLM [Quadro K620M]
Display Server: X.Org 1.17.1 drivers: nvidia (unloaded: intel)
Resolution: 1920x1080@59.9hz, 1920x1080@60.0hz
GLX Renderer: Quadro K620M/PCIe/SSE2 GLX Version: 4.5.0 NVIDIA 352.63
Audio: Card-1 Intel Wildcat Point-LP High Definition Audio Controller driver: snd_hda_intel
Card-2 Intel Broadwell-U Audio Controller driver: snd_hda_intel
Sound: Advanced Linux Sound Architecture v: k3.19.0-32-generic
Network: Card-1: Intel Ethernet Connection (3) I218-LM driver: e1000e
IF: eth0 state: up speed: 1000 Mbps duplex: full mac: 54:ee:75:cc:11:4a
Card-2: Intel Wireless 7265 driver: iwlwifi
IF: wlan0 state: up mac: 18:5e:0f:ee:f8:aa
Drives: HDD Total Size: 768.2GB (17.1% used) ID-1: /dev/sda model: LITEON_LCH size: 512.1GB
ID-2: /dev/sdb model: ADATA_SP600NS34 size: 256.1GB
Partition: ID-1: / size: 28G used: 9.4G (37%) fs: ext4 dev: /dev/sdb1
ID-2: /home size: 195G used: 60G (33%) fs: ext4 dev: /dev/sdb3
RAID: No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors: System Temperatures: cpu: 50.0C mobo: N/A gpu: 48C
Fan Speeds (in rpm): cpu: 2466
Info: Processes: 229 Uptime: 1:09 Memory: 2341.5/15748.3MB Client: Shell (bash) inxi: 2.2.28 |
Google announced plans to discontinue 32-bit Google Chrome for Linux and it has. On some 64bit Ubuntu based systems (Mint/Kubuntu/Xubuntu,..), during update process you may notice the next error:
“Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/Release Unable to find expected entry ‘main/binary-i386/Packages’ in Release file (Wrong sources.list entry or malformed file)” |
To fix this error you’ll need to make some changes in google-chrome.list
Open /etc/apt/sources.list.d/google-chrome.list file and add [arch=amd64] before “http”
deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main |
Do not edit or replace any other text in this file. Save the changes and refresh your package list with
sudo apt-get update |
The “failed to fetch” APT error should no longer appear
The Point-to-Point Tunneling Protocol (PPTP) is a method for implementing virtual private networks. Since it is marked as non secure and vulnerable, I don’t recommend it as a “final” VPN solution. The main reason for its popularity is probably the native MS Windows support (since win 95). Also, it can be easily implemented with Mikrotik RouterOS (like I said, use it for internal VPNs only).
To set up your CentOS box as a PPTP clients you’ll need the pptp package.
yum -y pptp |
Open /etc/ppp/chap-secrets and add the next line (at the end). Also, replace the userName and password with the correct details:
userName PPTP password * |
Create profile file
nano /etc/ppp/peers/myVPN |
and paste the next content (replace IP_OR_HOSTNAME with PPTP server IP or hostname)
pty "pptp IP_OR_HOSTNAME --nolaunchpppd" name userName remotename PPTP require-mppe-128 file /etc/ppp/options.pptp ipparam myVPN |
save the file and test the connection with
pppd call myVPN |
ifconfig should return something like
....
ppp0 Link encap:Point-to-Point Protocol
inet addr:10.16.18.252 P-t-P:10.16.18.251 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1436 Metric:1
RX packets:14 errors:0 dropped:0 overruns:0 frame:0
TX packets:15 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:2192 (2.1 KiB) TX bytes:631 (631.0 b)
... |
also in /var/log/messages you should see something like
Jul 20 10:58:50 mysrv pppd[9352]: pppd 2.4.5 started by root, uid 0 Jul 20 10:58:50 mysrv pppd[9352]: Using interface ppp0 Jul 20 10:58:50 mysrv pppd[9352]: Connect: ppp0 <--> /dev/pts/1 Jul 20 10:58:50 mysrv pptp[9353]: anon log[main:pptp.c:314]: The synchronous pptp option is NOT activated Jul 20 10:58:50 mysrv pptp[9361]: anon log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 1 'Start-Control-Connection-Request' Jul 20 10:58:50 mysrv pptp[9361]: anon log[ctrlp_disp:pptp_ctrl.c:739]: Received Start Control Connection Reply Jul 20 10:58:50 mysrv pptp[9361]: anon log[ctrlp_disp:pptp_ctrl.c:773]: Client connection established. Jul 20 10:58:51 mysrv pptp[9361]: anon log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 7 'Outgoing-Call-Request' Jul 20 10:58:51 mysrv pptp[9361]: anon log[ctrlp_disp:pptp_ctrl.c:858]: Received Outgoing Call Reply. Jul 20 10:58:51 mysrv pptp[9361]: anon log[ctrlp_disp:pptp_ctrl.c:897]: Outgoing call established (call ID 0, peer's call ID 716). Jul 20 10:58:51 mysrv pppd[9352]: CHAP authentication succeeded Jul 20 10:58:51 mysrv pppd[9352]: MPPE 128-bit stateless compression enabled Jul 20 10:58:51 mysrv pppd[9352]: local IP address 10.16.18.252 Jul 20 10:58:51 mysrv pppd[9352]: remote IP address 10.16.18.251 Jul 20 10:59:51 mysrv pptp[9361]: anon log[logecho:pptp_ctrl.c:677]: Echo Reply received. |
If you check your routes, you’ll probably notice that ppp0 connection is not used by any route(s). This is default behavior and you can easily switch/add default route with:
route add default dev ppp0 |
In my case, I don’t want to route the complete traffic (this VPN is just for management) so I’ll add only one static route
route add -net 192.168.120.0/24 dev ppp0 |
To start this connection on boot, add “pppd call myVPN” in rc.local.
The RAID functionality for the B120i and B320i controllers in the “e” series ProLiant servers is provided by a software driver (FakeRAID). The driver for these RAID controllers is available in binary form on HP site (Currently only for RHEL and SLES). CentOS users (of course) should download RHEL driver but in this case, do not expect support from HP.
Without drivers, the disks won’t be seen as a parts of RAID array.
Option 1 – disable controller / don’t use it
For systems with the B320i SAS controller
For systems with the B120i SATA controller
Option 2 – install drivers
To extract multiple 7z files at once, use the next script
for fileToExtract in *.7z do 7z x "$fileToExtract" done |
Remember, x option means extract files with full paths.
If you try to install Samsung printer (in my case ML1675) on Ubuntu 14.04 or Mint 17, you’ll may have some problems with missing file – rastertosplc.
If you added printer via web (http://localhost:631/) or via printer wizard, delete installed printer and follow the next instructions
Download drivers from this page: http://www.samsung.com/pk/support/model/ML-1675/XSG-downloads, extract them and install drivers with:
sudo ./install-printer.sh |
(follow the wizard to complete process)
cd into /usr/lib/cups/filter and check the existence of rastertosplc file.
If this file doesn’t exist add symbolic link to /opt/smfp-common/printer/bin/rastertospl with
sudo ln -s /opt/smfp-common/printer/bin/rastertospl rastertosplc |
after you should have something like
bla@bla-178 /usr/lib/cups/filter $ ls -la ... lrwxrwxrwx 1 root root 40 Aug 23 13:39 rastertospl -> /opt/smfp-common/printer/bin/rastertospl lrwxrwxrwx 1 root root 40 Aug 23 13:51 rastertosplc -> /opt/smfp-common/printer/bin/rastertospl ... |
The first file is probably created via install script while the second one is “fix” to “File “/usr/lib/cups/filter/rastertosplc” not available: No such file or directory” problem.
After you did this, add printer via wizard and try to print test page.
