Working with Raspberry Pi2, ModelB with below configurations:
$ uname -a
Linux raspberrypi 4.9.59+ #1047 Sun Oct 29 11:47:10 GMT 2017 armv6l GNU/Linux
$ cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)"
NAME="Raspbian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"
I have a MediaTek usb-adapter as below:
$ lsusb | grep 76
Bus 001 Device 004: ID 148f:7601 Ralink Technology, Corp. MT7601U Wireless Adapter
When trying to start "hostapd" for creating access-point, the below error is reported:
$ sudo /usr/local/bin/hostapd -ddd /etc/hostapd/hostapd.conf
random: Trying to read entropy from /dev/random
Configuration file: /etc/hostapd/hostapd.conf
Line 2: invalid/unknown driver 'mt7601u'
1 errors found in configuration file '/etc/hostapd/hostapd.conf'
However, the driver does exist,
$ ls /lib/modules/4.9.59+/kernel/drivers/net/wireless/mediatek/mt7601u
-rw-r--r-- 1 root root 126932 Oct 30 14:36 mt7601u.ko
Can someone please help point out what is going wrong here ? why is it not able to find the driver ?
Related
On my raspberry pi 3 i have Arch Linux Arm Installed. I installed xorg, i3, and all of the drivers for it. i have my xinitrc file set up like default to run i3:
#!/bin/sh
userresources=$HOME/.Xresources
usermodmap=$HOME/.Xmodmap
sysresources=/etc/X11/xinit/.Xresources
sysmodmap=/etc/X11/xinit/.Xmodmap
# merge in defaults and keymaps
if [ -f $sysresources ]; then
xrdb -merge $sysresources
fi
if [ -f $sysmodmap ]; then
xmodmap $sysmodmap
fi
if [ -f "$userresources" ]; then
xrdb -merge "$userresources"
fi
if [ -f "$usermodmap" ]; then
xmodmap "$usermodmap"
fi
# start some nice programs
if [ -d /etc/X11/xinit/xinitrc.d ] ; then
for f in /etc/X11/xinit/xinitrc.d/?*.sh ; do
[ -x "$f" ] && . "$f"
done
unset f
fi
exec i3
when I run sudo startx i get this output
X.Org X Server 1.21.1.4
X Protocol Version 11, Revision 0
Current Operating System: Linux archpi 5.15.68-2-rpi-ARCH #1 SMP Mon Sep 19 17:23:23 MDT 2022 armv7l
Kernel command line: coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 video=HDMI-A-1:1920x1080M#60 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 root=/dev/mmcblk0p2 rw rootwait console=ttyS0,115200 console=tty1 fsck.repair=yes
Current version of pixman: 0.40.0
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Thu Sep 22 04:48:27 2022
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
Failed to connect to bus: No medium found
dbus-update-activation-environment: error: unable to connect to D-Bus: Using X11 for dbus-daemon autolaunch was disabled at compile time, set your DBUS_SESSION_BUS_ADDRESS instead
[libi3] ../i3bar/src/main.c i3bar version 4.20.1 (2021-11-03)
[libi3] ../libi3/font.c Using Pango font monospace, size 8
[libi3] ../libi3/font.c Using Pango font monospace, size 8
i3status: trying to auto-detect output_format setting
i3status: auto-detected "i3bar"
[libi3] ../libi3/font.c Using Pango font monospace, size 8
the error is in Failed to connect to bus: No medium found dbus-update-activation-environment: error: unable to connect to D-Bus: Using X11 for dbus-daemon autolaunch was disabled at compile time, set your DBUS_SESSION_BUS_ADDRESS instead
I have looked for hours and can not find a way to fix this. After running sudo startx My screen just goes dark and I have to reboot. I appreciate any help give, thanks.
I'm trying to setup a minecraft server for my kid and screen is giving me fits. I've been following this tutorial and I've already consulted this AskUbuntu answer. I'm running on Ubuntu 16.04.5 x64. I have created the following Service file and linked it to /etc/systemd/system/minecraft.service.
[Unit]
Description=Minecraft Server
Documentation=
Wants=network.target
After=network.target
[Service]
User=minecraft
Group=minecraft
Nice=5
EnvironmentFile=-/var/minecraft/unit.conf
KillMode=none
SuccessExitStatus=0 1
ProtectHome=true
ProtectSystem=full
PrivateDevices=true
NoNewPrivileges=true
PrivateTmp=true
InaccessibleDirectories=/root /sys /srv -/opt /media -/lost+found
ReadWriteDirectories=/var/minecraft/server /usr/bin/screen
WorkingDirectory=/var/minecraft/server
#ExecStartPre= /usr/bin/screen -dmS Minecraft
ExecStart= /usr/bin/screen -dm -S Minecraft '/usr/bin/java -Xmx1500M -Xms1024M -jar /var/minecraft/server/craftbukkit-1.13.jar'
ExecStop=/usr/bin/screen -S minecraft -p 0 -X stuff "stop^M"
[Install]
WantedBy=multi-user.target
When I monitor the service startup, I get the following in the journalctl logs:
Aug 05 14:55:41 spigot-1 systemd[1]: Started Minecraft Server.
Aug 05 14:55:41 spigot-1 screen[9869]: No screen session found.
Per the SO post I referenced, I already changed the permissions in /var/run/screen. This is the current setup:
root#spigot-1:/var/minecraft/server# ls -alR /var/run/screen/
/var/run/screen/:
total 0
drwxrwxrwx 4 root root 80 Aug 5 14:12 .
drwxr-xr-x 23 root root 860 Aug 5 14:11 ..
drwx------ 2 minecraft minecraft 40 Aug 5 14:55 S-minecraft
drwx------ 2 root root 40 Aug 5 14:50 S-root
/var/run/screen/S-minecraft:
total 0
drwx------ 2 minecraft minecraft 40 Aug 5 14:55 .
drwxrwxrwx 4 root root 80 Aug 5 14:12 ..
/var/run/screen/S-root:
total 0
drwx------ 2 root root 40 Aug 5 14:50 .
drwxrwxrwx 4 root root 80 Aug 5 14:12 ..
** Debug Notes **
You'll see the commented ExecStartPre command in there... all that happens if I try to start the screen session with that command is I get a second 'No screen session found' error.
I can launch the server from the command line using 'screen -dmS Minecraft [..]' and reattach. I can do this both as root and as the 'minecraft' user.
Any help would be greatly appreciated
I don't have Ubuntu to hand, but I tried something similar on Fedora 24 and had a similar error. To investigate I added an strace to the screen command and removed PrivateTmp so that I could get the trace output.
ExecStart=/bin/strace -o /tmp/s -f screen -dm -S me bash -c 'sleep 999'
In the output I found that at the end, screen was trying to open a pseudo-tty and failed to do so:
open("/dev/ptmx", O_RDWR) = -1 EACCES (Permission denied)
...
write(1, "No more PTYs.\r\nSorry, could not "..., 52) = 52
I added some ls -l /dev commands to the Unit to see what the effect of the PrivateDevices=true option had been. There was indeed a /dev/ptmx file, but unlike my real /dev it was a symbolic link to /dev/pts/ptmx, instead of just being the special character device. For some reason on my system I have:
$ ls -l /dev/ptmx /dev/pts/ptmx
crw-rw-rw- 1 root tty 5, 2 Aug 6 14:29 /dev/ptmx
c--------- 1 root root 5, 2 Jun 27 08:29 /dev/pts/ptmx
(This is probably a bug depending on the version of systemd and udev.)
So when /dev/ptmx is replaced in the private namespace by a symbolic link to /dev/pts/ptmx, you can no longer open a new pty. A simple fix for testing was sudo chmod a+rw /dev/pts/ptmx which indeed made the Unit work and start the screen process.
This may not be the case for you, but you could undertake a similar debug method to try to find the problem.
I started this quest with redis/3.0.3 installed, and looking to upgrade my local dev redis to version 3.2.3, which is what we're running in production. I ultimately ran brew upgrade redis, which installed redis 4.0.2, ahead of my desired version. Then I found that you can install 3.2.x with brew install redis#3.2. Also, while trying to cleanup 4.0.2, instead it cleaned up only 3.0.3.
Now I'm stuck in a situation where Homebrew won't allow me to uninstall redis/4.0.2, and views redis#3.2 as a separate Homebrew Formula.
$ brew switch redis 3.2
Error: redis does not have a version "3.2" in the Cellar.
Versions available: 4.0.2
See how in the Cellar, they're showing as separate Formulae here:
$ ls /usr/local/Cellar/ | grep redis
redis
redis#3.2
What is the correct "Homebrew" way to remove redis/4.0.2 and use redis#3.2 as my default redis, so that commands to redis-server and redis-cli reference 3.2 instead? I'm running Mac OS X Yosemite 10.10.5 and Homebrew 1.3.4.
$ ls -l /usr/local/bin/ | grep redis
lrwxr-xr-x 1 jsoro wheel 41 Oct 5 12:51 redis-benchmark -> ../Cellar/redis/4.0.2/bin/redis-benchmark
lrwxr-xr-x 1 jsoro wheel 41 Oct 5 12:51 redis-check-aof -> ../Cellar/redis/4.0.2/bin/redis-check-aof
lrwxr-xr-x 1 jsoro wheel 41 Oct 5 12:51 redis-check-rdb -> ../Cellar/redis/4.0.2/bin/redis-check-rdb
lrwxr-xr-x 1 jsoro wheel 35 Oct 5 12:51 redis-cli -> ../Cellar/redis/4.0.2/bin/redis-cli
lrwxr-xr-x 1 jsoro wheel 40 Oct 5 12:51 redis-sentinel -> ../Cellar/redis/4.0.2/bin/redis-sentinel
lrwxr-xr-x 1 jsoro wheel 38 Oct 5 12:51 redis-server -> ../Cellar/redis/4.0.2/bin/redis-server
The issue was trivial and could have been easier if the Brew Docs/FAQs were more clear. The Brew FAQs say that uninstalls are handled by brew cleanup <formula>, which is what caused my redis/3.0.3 to be removed. However, brew cleanup would not remove redis/4.0.2. To remove it I used brew uninstall, which I could not find in the Docs...
$ brew uninstall redis
Uninstalling /usr/local/Cellar/redis/4.0.2... (11 files, 2.7MB)
Then, to fix the remaining issue of redis#3.2 not being symlinked under /usr/local/bin/, I first tried an uninstall/re-install of redis#3.2 to see if Homebrew would take care of it...
$ ls -l /usr/local/bin/ | grep redis
$ brew uninstall redis#3.2
Uninstalling /usr/local/Cellar/redis#3.2/3.2.11... (11 files, 1.7MB)
$ brew install redis#3.2
==> Downloading http://download.redis.io/releases/redis-3.2.11.tar.gz
## TRIMMED ##
==> Summary
🍺 /usr/local/Cellar/redis#3.2/3.2.11: 11 files, 1.7MB, built in 10 seconds
Of course, this did not create the symlinks--actually the Caveats section which I trimmed away from the output says this explicitly with suggestions. Instead of using their suggestion, I opted to create symlinks manually:
$ cd /usr/local/bin/
$ ls -l | grep redis
$
$ ln -s /usr/local/Cellar/redis\#3.2/3.2.11/bin/redis-check-aof redis-check-aof
$ ln -s /usr/local/Cellar/redis\#3.2/3.2.11/bin/redis-check-rdb redis-check-rdb
$ ln -s /usr/local/Cellar/redis\#3.2/3.2.11/bin/redis-cli redis-cli
$ ln -s /usr/local/Cellar/redis\#3.2/3.2.11/bin/redis-sentinel redis-sentinel
$ ln -s /usr/local/Cellar/redis\#3.2/3.2.11/bin/redis-server redis-server
$ ls -l | grep redis
lrwxr-xr-x 1 jsoro wheel 54 Oct 5 14:27 redis-check-aof -> /usr/local/Cellar/redis#3.2/3.2.11/bin/redis-check-aof
lrwxr-xr-x 1 jsoro wheel 54 Oct 5 14:27 redis-check-rdb -> /usr/local/Cellar/redis#3.2/3.2.11/bin/redis-check-rdb
lrwxr-xr-x 1 jsoro wheel 48 Oct 5 14:27 redis-cli -> /usr/local/Cellar/redis#3.2/3.2.11/bin/redis-cli
lrwxr-xr-x 1 jsoro wheel 53 Oct 5 14:27 redis-sentinel -> /usr/local/Cellar/redis#3.2/3.2.11/bin/redis-sentinel
lrwxr-xr-x 1 jsoro wheel 51 Oct 5 14:26 redis-server -> /usr/local/Cellar/redis#3.2/3.2.11/bin/redis-server
The last thing to note is that since I had run the redis-server while under the redis/4.0.2 version, the dump.rdb file was no longer compatible. Running redis-server using redis 3.2.x on a 4.x dump.rdb causes the server to exit immediately.
$ redis-server
## TRIMMED ##
38504:M 05 Oct 14:29:07.234 # Server started, Redis version 3.2.11
38504:M 05 Oct 14:29:07.259 # Can't handle RDB format version 8
38504:M 05 Oct 14:29:07.260 # Fatal error loading the DB: Invalid argument. Exiting.
Unfortunately you need to rm dump.rdb, or remove/rename the dump.rdb file, in order to get redis-server to start up again.
I want to be able to read and write ttyACM device, particularly Arduino Leonardo board under Fedora.
I made a following rule:
SUBSYSTEM=="tty", ATTRS{idVendor}=="2341", ATTRS{idProduct}=="8036", SYMLINK+="arduino", MODE="0660", GROUP="plugdev"
Symlink is created but I do not have permission to read the device:
[nexy#shire ~]$ cat /dev/arduino
cat: /dev/arduino: Permission denied
Showing ls gives the following:
[nexy#shire ~]$ ls -l /dev/arduino /dev/ttyACM0
lrwxrwxrwx. 1 root root 7 Dec 18 15:25 /dev/arduino -> ttyACM0
crw-rw----. 1 root dialout 166, 0 Dec 18 15:25 /dev/ttyACM0
When I change mode to 0666 then it works. I belong to the group plugdev:
[nexy#shire ~]$ sudo groups nexy
nexy : nexy wheel plugdev
You might have to log out and log back in or restart your computer if you just added yourself to the group recently.
backup.sh has :
#!/bin/bash
expect backup.exp
tr -d '\15\32' < backup.templog > backup.log
backup.exp has next content:
#!/usr/bin/expect -f
puts "----------------- [exec date +%Y.%m.%d\ %H:%M:%S] ------ exp start -----\n"
spawn ssh root#someIP2
expect "# "
send "su - postgres\r"
expect "\$ "
send "ls -lh db.dump.gz\r"
send exit\r
send exit\r
interact
when I run manually like next:
bash backup.sh >> backup.templog 2>&1
I get next, which I like:
spawn ssh root#someIP
Linux db01 3.2.0-4-amd64 #1 SMP Debian 3.2.68-1+deb7u1 x86_64
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Wed Sep 2 11:06:02 2015 from someIP2
root#db01:~# su - postgres
postgres#db01:~$ ls -lh /var/lib/postgresql/db.dump.gz
-rw-r--r-- 1 postgres postgres 218M Sep 2 10:39 /var/lib/postgresql/db.dump.gz
postgres#db01:~$ exit
logout
root#db01:~# exit
logout
Connection to someIP2 closed.
but with cron (has a line):
* * * * * bash backup.sh >> backup.templog 2>&1
I get only next:
spawn ssh root#someIP2
Linux db01 3.2.0-4-amd64 #1 SMP Debian 3.2.68-1+deb7u1 x86_64
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Wed Sep 2 11:04:13 2015 from someIP1
root#db01:~# su - postgres
postgres#db01:~$
Can I get the same with cron and manually?