Engineering and technology

Configure LDAP Client on Ubuntu 20.04|18.04|16.04 | ComputingForGeeks

Jovan Stosic April 24, 2021

Configure LDAP Client on Ubuntu 20.04|18.04|16.04

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Josphat Mutai

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This is a guide on how to configure an Ubuntu 20.04|18.04 & Ubuntu 16.04 LTS servers to authenticate against an LDAP directory server. LDAP is a lightweight client-server protocol for accessing directory services, specifically X.500-based directory services.

I expect you already have a running LDAP server, if not, use our guides below to set it up:

How to Install and configure OpenLDAP on Ubuntu LTS

Once you have LDAP server configured and user accounts added, you can proceed to install and configure LDAP client.

Install and Configure LDAP Client on Ubuntu 20.04|18.04 & Ubuntu 16.04 LTS

Add LDAP server address to /etc/hosts file if you don’t have an active DNS server in your network.

$ sudo vim /etc/hosts
192.168.18.50 ldap.example.com

Install LDAP client utilities on your Ubuntu system:

sudo apt -y install libnss-ldap libpam-ldap ldap-utils

Begin configuring the settings to look like below

1. Set LDAP URI- This can be IP address or hostname

ldap client ubuntu 18.04 add uri min

2. Set a Distinguished name of the search base

ldap client ubuntu 18.04 set search base distinguished name min

3. Select LDAP version 3

ldap client ubuntu 18.04 set ldap version min

4. Select Yes for Make local root Database admin

ldap client ubuntu 18.04 make local root database admin min

5. Answer No for Does the LDAP database require login?

ldap client ubuntu 18.04 does ldap require login no min

6. Set LDAP account for root, something like cn=admin,cd=example,cn=com

ldap client ubuntu 18.04 set admin ldap account min

7. Provide LDAP root account Password

ldap client ubuntu 18.04 enter ldap admin pass min

After the installation, edit /etc/nsswitch.confand add ldap authentication to passwd and group lines.

passwd: compat systemd ldap
group: compat systemd ldap
shadow: compat

Modify the file /etc/pam.d/common-password. Remove use_authtok on line 26 to look like below.

password [success=1 user_unknown=ignore default=die] pam_ldap.so try_first_pass

Enable creation of home directory on first login by adding the following line to the end of file /etc/pam.d/common-session

session optional pam_mkhomedir.so skel=/etc/skel umask=077

See below screenshot:

ldap client enable home creation min

Test by switching to a user account on LDAP

root@server1:~# su - jmutai
Creating directory '/home/jmutai'.
jmutai@server1:~$ id
uid=10000(jmutai) gid=10000(sysadmins) groups=10000(sysadmins)

That’s all. If you need advanced centralized user management platform, see

Source: Configure LDAP Client on Ubuntu 20.04|18.04|16.04 | ComputingForGeeks

windows – How to export/import PuTTy sessions list? 

Jovan Stosic April 24, 2021

Export

cmd.exe, require elevated prompt:

Only sessions:

regedit /e "%USERPROFILE%\Desktop\putty-sessions.reg" HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions

All settings:

regedit /e "%USERPROFILE%\Desktop\putty.reg" HKEY_CURRENT_USER\Software\SimonTatham

Powershell:

Only sessions:

reg export HKCU\Software\SimonTatham\PuTTY\Sessions ([Environment]::GetFolderPath("Desktop") + "\putty-sessions.reg")

All settings:

reg export HKCU\Software\SimonTatham ([Environment]::GetFolderPath("Desktop") + "\putty.reg")

Import

Double-click on the *.reg file and accept the import.

Source: windows – How to export/import PuTTy sessions list? – Stack Overflow

DNS not working after upgrade to 18.04

Jovan Stosic April 16, 2021

Usually systemd-resolved gets the DNS servers from the DHCP handshake. Does your DHCP server give out the DNS addresses?

Also you can edit /etc/systemd/resolved.conf and add the IP address(es) of your server(s) on the DNS and FallbackDNS lines.

Code:
[Resolve]
DNS=192.168.100.100
FallbackDNS=8.8.8.8
[etc.]

192.168.100.100 is a local server on my network. You need to run “sudo systemctl restart systemd-resolved” after making any changes.

Source: [SOLVED] DNS not working after upgrade to 18.04

Get Started – ESP32 – — ESP-IDF Programming Guide latest documentation

Jovan Stosic April 7, 2021

Encountered Issues While Flashing?

If you run the given command and see errors such as “Failed to connect”, there might be several reasons for this. One of the reasons might be issues encountered by esptool.py, the utility that is called by the build system to reset the chip, interact with the ROM bootloader, and flash firmware. One simple solution to try is manual reset described below, and if it does not help you can find more details about possible issues in Troubleshooting.

esptool.py resets ESP32 automatically by asserting DTR and RTS control lines of the USB to serial converter chip, i.e., FTDI or CP210x (for more information, see Establish Serial Connection with ESP32). The DTR and RTS control lines are in turn connected to GPIO0 and CHIP_PU (EN) pins of ESP32, thus changes in the voltage levels of DTR and RTS will boot ESP32 into Firmware Download mode. As an example, check the schematic for the ESP32 DevKitC development board.

In general, you should have no problems with the official esp-idf development boards. However, esptool.py is not able to reset your hardware automatically in the following cases:

  • Your hardware does not have the DTR and RTS lines connected to GPIO0 and CHIP_PU

  • The DTR and RTS lines are configured differently

  • There are no such serial control lines at all

Depending on the kind of hardware you have, it may also be possible to manually put your ESP32 board into Firmware Download mode (reset).

  • For development boards produced by Espressif, this information can be found in the respective getting started guides or user guides. For example, to manually reset an esp-idf development board, hold down the Boot button (GPIO0) and press the EN button (CHIP_PU).

  • For other types of hardware, try pulling GPIO0 down.

https://docs.espressif.com/projects/esp-idf/en/latest/esp32/get-started/