Edit /etc/NetworkManager/NetworkManager.conf file and comment out the line dns=dnsmasq
Author: Pablo
Ubuntu 16.04 – WPA/WPA2 WiFi network (command line)
Turn interface up
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sudo ip link set wlan0 up |
Scan wireless networks
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sudo iw wlan0 scan |
Create password for the SSID:
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wpa_passphrase <strong>SSID</strong>>> /etc/wpa_supplicant.conf |
Connect
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sudo wpa_supplicant -B -D wext -i wlan0 -c /etc/wpa_supplicant.conf |
Start dhclient
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sudo dhclient wlan0 |
Add default IP:
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sudo ip route add default via 10.0.0.10 dev wlan0 |
Ubuntu 16.04 – rename a network interface
Create the file /etc/udev/rules.d/70-persistent-net.rules
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SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="02:01:02:03:04:05", ATTR{dev_id}=="0x0", ATTR{type}=="1", NAME="eth0" |
where eth0 is the name that you want to use.
Auto-Start a Virtual Machine at XenServer 7.X
Enable auto-start on XenServer:
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# xe pool-list uuid ( RO) : XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX |
copy the UUID and use:
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# xe pool-param-set uuid=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX other-config:auto_poweron=true |
Now XenServer supports auto-start. Let’s find the correct VM:
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# xe vm-list uuid ( RO) : XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX name-label ( RW): Control domain on host: XenSever_host_name power-state ( RO): running uuid ( RO) : AAAAAAAA-AAAA-AAAA-AAAA-AAAAAAAAAAAA name-label ( RW): VM_host_name_1 power-state ( RO): running uuid ( RO) : BBBBBBBB-BBBB-BBBB-BBBB-BBBBBBBBBBBB name-label ( RW): VM_host_name_2 power-state ( RO): running |
To auto-start the VM_host_name1, just:
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# xe vm-param-set uuid=AAAAAAAA-AAAA-AAAA-AAAA-AAAAAAAAAAAA other-config:auto_poweron=true |
Done, now with XenCenter, we can modify the auto-start order and delays.
Date/Time tools for Java
Simple class to play with dates and time.
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import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; /** * * @author Pablo Puñal Pereira <pablo@punyal.com> */ public class DateTools { private static long dateSeconds2Long(String date) { try { return ((new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")).parse(date)).getTime(); } catch (ParseException ex) { return 0; } } private static long dateMillis2Long(String date) { try { return ((new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS")).parse(date)).getTime(); } catch (ParseException ex) { return 0; } } public static long date2Long(String date) { long millis = dateMillis2Long(date); if (millis > 0) return millis; else return dateSeconds2Long(date); } public static String long2DateSeconds(long millis) { return (new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(millis))); } public static String long2DateMillis(long millis) { return (new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS").format(new Date(millis))); } public static String long2Date(long millis) { return (new SimpleDateFormat("yyyy-MM-dd").format(new Date(millis))); } public static String long2Time(long millis) { return (new SimpleDateFormat("HH:mm:ss").format(new Date(millis))); } public static String nowSeconds() { return long2DateSeconds(System.currentTimeMillis()); } public static String nowMillis() { return long2DateMillis(System.currentTimeMillis()); } } |
Propagate IPv6 with radvd in Linux
1 – Install radvd
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sudo apt-get install radvd |
2 – Configure radvd [/etc/radvd.conf]
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interface p4p1 { AdvSendAdvert on; AdvLinkMTU 1280; MaxRtrAdvInterval 300; prefix fcfc::/64 { AdvOnLink on; AdvAutonomous on; AdvRouterAddr on; }; route fdfd::/64 { }; }; |
3 – Configure Network interfaces [/etc/network/interfaces]
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# This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto p4p1 iface p4p1 inet static address 10.0.1.220 netmask 255.255.255.0 gateway 10.0.1.1 dns-nameservers 8.8.8.8 # IPv6 - radvd auto p4p1 allow-hotplug p4p1 iface p4p1 inet6 static address fcfc::1 netmask 64 |
4 – Configure SysCtl [/etc/sysctl.conf]
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# See http://lwn.net/Articles/277146/ # Note: This may impact IPv6 TCP sessions too #net.ipv4.tcp_syncookies=1 # Uncomment the next line to enable packet forwarding for IPv4 #net.ipv4.ip_forward=1 # Uncomment the next line to enable packet forwarding for IPv6 # Enabling this option disables Stateless Address Autoconfiguration # based on Router Advertisements for this host net.ipv6.conf.all.forwarding=1 ################################################################### # Additional settings - these settings can improve the network # security of the host and prevent against some network attacks # including spoofing attacks and man in the middle attacks through # redirection. Some network environments, however, require that these # settings are disabled so review and enable them as needed. # # Do not accept ICMP redirects (prevent MITM attacks) #net.ipv4.conf.all.accept_redirects = 0 #net.ipv6.conf.all.accept_redirects = 0 # _or_ # Accept ICMP redirects only for gateways listed in our default # gateway list (enabled by default) # net.ipv4.conf.all.secure_redirects = 1 # # Do not send ICMP redirects (we are not a router) #net.ipv4.conf.all.send_redirects = 0 # # Do not accept IP source route packets (we are not a router) #net.ipv4.conf.all.accept_source_route = 0 #net.ipv6.conf.all.accept_source_route = 0 # # Log Martian Packets #net.ipv4.conf.all.log_martians = 1 # |
UP board – hands on (first steps)
First hours with the UP board, an Atom computer with a raspberry pi form factor.
OS selection
Ubilinux 3.0RC3
A Desktop distro, based on Debian 8 Jessie.
Debian 8 Jessie NetInstall
Standard Debian distro, with no support for the eMMC. Only works with an external HHD. 🙁
Ubuntu 14.04 Server (Chosen)
It has drivers support by PPA.
Ubuntu 14.04 Server Installation
Drivers
I don’t know if the newest version 16.04 LTS is working, on the official guide they recommend the 14.04. After the installation we need to install the drivers for the specific UP hardware via PPA:
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sudo add-apt-repository ppa:ubilinux/up sudo apt-get update sudo apt-get install linux-upboard |
After installation reboot the system.
Network configuration
The UP board will act as a server, so the network configuration must be static to open ports. Edit /etc/network/interfaces
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# This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto p4p1 iface p4p1 inet static address X.X.X.Z netmask 255.255.255.0 gateway X.X.X.1 dns-nameservers 8.8.8.8 #Google |
Reboot and disconnect the HDMI cable.
Java 8 installation
Ubuntu has any Java version installed, which is great to do a clean installation. This step is easy with the PPA installation by WebUpd8.
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sudo add-apt-repository ppa:webupd8team/java sudo apt-get update sudo apt-get install oracle-java8-installer |
Check that the installation was ok with “java -version”, the output should be (or something similar):
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java version "1.8.0_91" Java(TM) SE Runtime Environment (build 1.8.0_91-b14) Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode) |
The JAVA_HOME should be configured by the oracle-java8-installer packet.
Compilers
gcc, make and other support to program arm-based microcontrollers
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sudo apt-get install build-essential sudo apt-get install gcc-arm-none-eabi sudo apt-get install openocd |
Git
git is not included by default
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sudo apt-get install git |
Observed bugs/problems/issues
- The screen never reacts after turns black
- Some USB devices require a reboot to work properly