• Elk Development Journal (1) – elastic 7.2.0 auto start, MySQL batch import, user authentication, SSL communication, Chinese Pinyin segmentation


    Recently, I did search system service for my platform and found elk, a treasure. I took a hole first and wrote some experience while learning 1、 Development path 1. Deploy elasticsearch to serve the system Download the v7.2.0 Debian installation package, which can’t be used for free in the version less than 7.2.0 Download address: […]

  • Learning notes of autolabor 2.5 (1) — Introduction to autolabor 2.5 car


    Just extrapolated to the graduate student of Beijing University of science and technology, the teacher bought two autolabor 2.5 trolleys as our entry-level learning equipment, and first recorded the overall situation of the trolleys. reference material: Official website of autolabor: http://www.autolabor.com.cn/ 1. Specifications of autolabor 2.5 Carbody material Thickened acrylic On board computer Raspberry pie […]

  • Learning notes of autolabor 2.5 (2) — ROS installation method and related configuration


    The first thing we need to do is to install the ROS operating system. This section will introduce the installation method and related configuration of the ROS operating system. reference material: ROS Wiki:http://wiki.ros.org/ROS ROS Qt Creator Plug-in Wiki:https://ros-qtc-plugin.readth… 1. Confirm the version of ROS to be installed The corresponding relationship between ROS and Ubuntu is […]

  • Study notes of autolabor 2.5 (3) — working space and compiling system of ROS


    The main content of this chapter is to elaborate the working space and compiling system of ROS. reference material: ROS Wiki:http://wiki.ros.org/ROS ROS self study note 4 — workspace and compiling system: https://blog.csdn.net/qq_ The following figure shows an engineering structure of ROS, reflecting the relationship between file systems. This is a typical ROS project. Let’s introduce […]

  • Tutorial of installing youcompleteme with VIM under Ubuntu


    Tutorial of installing youcompleteme in VIM under Ubuntu 16.4 Youcompleteme is a VIM code prompt plug-in 1 check VIM version first vim –version As shown below VIM – Vi IMproved 7.4 (2013 Aug 10, compiled Nov 24 2016 16:44:48) Included patches: 1-1689 Extra patches: 8.0.0056 Modified by [email protected] Compiled by [email protected] Huge version without GUI. […]

  • Ubuntu installation EMQ X server Guide


    system requirements Bionic 18.04 (LTS) Xenial 16.04 (LTS) Trusty 14.04 (LTS) Precise 12.04(LTS) Install EMQ X You can install EMQ X in different ways as needed: Set up and install the image library of EMQ x for installation and upgrade tasks. Download and install the package manually. Install EMQ X using image library Before installing […]

  • Kubuntu 18.04 default theme breeze dark plasma theme repair Journal


    KDE Plasma 5.12 LTS The reason is that at 5:30 p.m., the lock screen picture was changed. Later, I thought that the hard disk space was not large and the solid background was deleted I found that there was a problem when I set the picture. Some items were not displayed. I thought they would […]

  • Running sudo without password in Ubuntu and CentOS


    Execute sudo command without password Is it possible to execute sudo without password under Ubuntu? The answer is yes. In this article, we provide several ways to implement it. Sudo is the basic command to run all commands with “super user rights” in Linux. To grant user sudo access, you need to add the user […]

  • How to avoid the creation platform of popular dramas because of “problem map” stepping on thunder?


    “Problem map” appeared in the recently broadcast TV series “dear, beloved”. Some netizens reported that the map appeared in its 39 episode “lost” Taiwan and Hainan Island, and the border between China and India was also marked in Indian version. Online public outcry, China’s “not a little bit less” Declaration of one after another. In […]

  • FRR learning day 6 – evpn centralized L3 gateway


    Evpn centralized L3 Gateway — cross subnet message forwarding Spine configuration Interface configuration sudo ip link add vbdif10 type bridge sudo ip link add vbdif20 type bridge sudo ip link set vbdif10 up sudo ip link set vbdif20 up sudo ip link add vxlan20 type vxlan id 20 local dstport 4789 nolearning sudo ip […]

  • FRR learning day 7 – distributed asymmetric gateway


    Distributed asymmetric gateway Spine configuration BGP evpn configuration router bgp 7677 bgp router-id bgp bestpath as-path multipath-relax neighbor fabric peer-group neighbor fabric remote-as external neighbor peer-group fabric neighbor peer-group fabric ! address-family l2vpn evpn neighbor fabric activate exit-address-family ! Leaf1 and host1 configuration Interface configuration #Turn on Forwarding sudo sysctl -w net.ipv4.ip_forward=1 […]

  • The 10th day of FRR learning — zebra process analysis


    Start zebra process sudo zebra -d View zebra process status [email protected]:~$ sudo top -b -n 1 -H -p `pidof zebra` top – 03:23:38 up 10 min, 1 user, load average: 0.05, 0.17, 0.19 Threads: 2 total, 0 running, 2 sleeping, 0 stopped, 0 zombie %Cpu(s): 6.2 us, 0.0 sy, 0.0 ni, 93.8 id, 0.0 wa, […]