troglobit / Mylinux
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Introduction
myLinux is a small UNIX like OS for embedded systems based on Westermo NetBox, which in turn is based on the fine Buildroot project. It serves as a testing ground for various embedded networking hardware and open source software projects by the main author.
myLinux can be used to test software components in Qemu before deploying to an embedded target, or as a reference to other embedded Linux systems.
Building
Buildroot is almost stand-alone, but need a few locally installed tools to bootstrap itself. For details, see the excellent manual. Briefly, to build a myLinux image; select the target and then make:
make espressobin_defconfig
make
Online help is available:
make help
To see available defconfigs for supported targets, use:
make list-defconfigs
Monitoring with SNMP
myLinux use mini-snmpd as its SNMP agent. It is very small and therefore also very limited in functionality, but it is enough to monitor myLinux by remote if needed.
initctl enable snmpd
initctl reload
To test it you need an SNMP client. The following command installs
snmpset, snmpget, snmpwalk, base MIBs and all standard MIBs
needed. You may also be interested in a more graphical alternative,
snmpB
sudo apt-get install snmp libsnmp-base snmp-mibs-downloader
When done you should be able to do the following:
snmpwalk -v2c -c public 192.0.2.42
SNMPv2-MIB::sysDescr.0 = STRING: myLinux Linux Virtual Devboard
SNMPv2-MIB::sysObjectID.0 = OID: SNMPv2-SMI::enterprises
SNMPv2-MIB::sysUpTime.0 = Timeticks: (465) 0:00:04.65
SNMPv2-MIB::sysContact.0 = STRING: [email protected]
SNMPv2-MIB::sysName.0 = STRING: chaos
SNMPv2-MIB::sysLocation.0 = STRING: GitHub
IF-MIB::ifNumber.0 = INTEGER: 1
IF-MIB::ifIndex.1 = INTEGER: 1
IF-MIB::ifDescr.1 = STRING: eth0
IF-MIB::ifOperStatus.1 = INTEGER: up(1)
IF-MIB::ifInOctets.1 = Counter32: 5557
IF-MIB::ifInUcastPkts.1 = Counter32: 45
IF-MIB::ifInDiscards.1 = Counter32: 0
IF-MIB::ifInErrors.1 = Counter32: 0
IF-MIB::ifOutOctets.1 = Counter32: 2958
IF-MIB::ifOutUcastPkts.1 = Counter32: 19
IF-MIB::ifOutDiscards.1 = Counter32: 0
IF-MIB::ifOutErrors.1 = Counter32: 0
SNMPv2-SMI::mib-2.25.1.1.0 = Timeticks: (71983) 0:11:59.83
snmpget -c public -v 2c 192.0.2.42 system.sysUpTime.0
SNMPv2-MIB::sysUpTime.0 = Timeticks: (2344) 0:00:23.44
Note: Other SNMP agents are also available in Buildroot, but mini-snmpd is pre-selected for myLinux targets.
Dropbear SSH
The most common embedded SSH daemon in use on embedded Linux systems today is Dropbear by the incredibly humble Matt Johnston.
Dropbear is one of a few services enabled by default in myLinux, it
allows root access, but we recommend disabling this and setting up a
regular user account after install.
Using Telnet
The Busybox telnetd is available in myLinux, for security reasons it
is disabled by default, so you have to enable it:
initctl enable telnetd
initctl reload
Bugs & Feature Requests
Feel free to report bugs and request features, or even submit your own pull requests using GitHub
Licensing & References
With the exceptions listed below, myLinux v2 is distributed under the same terms as Buildroot, the GNU GPL. myLinux is only the build system, or glue, that ties the various Open Source components together. Each project included comes with source code, and sometimes local patch files, all with their own license and restrictions.