chrony is an implementation of NTP, which performs well in a wide range of conditions, including intermittent network connections, heavily congested networks, changing temperatures (ordinary computer clocks are sensitive to temperature), and systems that do not run continuously, or run on a virtual machine.
Lock My PC V4.7 Serial [ Kk ] 64 Bit
This update adds a new data chunk type, I-DATA, and stream schedulers to the Stream Control Transmission Protocol (SCTP). Previously, SCTP sent user messages in the same order as they were sent by a user. Consequently, a large SCTP user message blocked all other messages in any stream until completely sent. When using I-DATA chunks, the Transmission Sequence Number (TSN) field is not overloaded. As a result, SCTP now can schedule the streams in different ways, and I-DATA allows user messages interleaving (RFC 8260). Note that both peers must support the I-DATA chunk type.
The XFS file system supports shared copy-on-write data extent functionality. This feature enables two or more files to share a common set of data blocks. When either of the files sharing common blocks changes, XFS breaks the link to common blocks and creates a new file. This is similar to the copy-on-write (COW) functionality found in other file systems.
Due to the internal flexible layout, LUKS2 is also an enabler of future features. It supports auto-unlocking through the generic kernel-keyring token built in libcryptsetup that allow users unlocking of LUKS2 volumes using a passphrase stored in the kernel-keyring retention service.
DIF/DIX increases the size of the commonly used 512 byte disk block from 512 to 520 bytes, adding the Data Integrity Field (DIF). The DIF stores a checksum value for the data block that is calculated by the Host Bus Adapter (HBA) when a write occurs. The storage device then confirms the checksum on receipt, and stores both the data and the checksum. Conversely, when a read occurs, the checksum can be verified by the storage device, and by the receiving HBA.
In RHEL 8, LVM uses the LVM lock daemon lvmlockd instead of clvmd for managing shared storage devices in an active/active cluster. This requires that you configure the logical volumes on which you mount a GFS2 file system as shared logical volumes.
To use GFS2 file systems that were created on a RHEL 7 system in a RHEL 8 cluster, you must configure the logical volumes on which they are mounted as shared logical volumes in a RHEL 8 system, and you must start locking for the volume group. For an example of the procedure that configures existing RHEL 7 logical volumes as shared logical volumes for use in a RHEL 8 Pacemaker cluster, see Migrating a GFS2 file system from RHEL7 to RHEL8.
With this update, you can use the RHEL 8 web console interface to apply Policy-Based Decryption (PBD) rules to disks on managed systems. This uses the Clevis decryption client to facilitate a variety of security management functions in the web console, such as automatic unlocking of LUKS-encrypted disk partitions.
There is yet another wrinkle in that in the latest Jessie / Stretch / Buster releases (as of August 2019) the GPIO serial port is disabled by default. In order to enable it, edit config.txt:
Nice post. As raspi-config is not available on ubuntu 18.04, Pi4, I have to do it in manually. So basically, to enable the UART for serial communication other than console:1) enable_uart=12) $ sudo systemctl stop serial-getty@ttyS0.service, $ sudo systemctl disable serial-getty@ttyS0.service3) $ sudo nano /boot/cmdline.txt and remove the line: console=serial0,115200 and save ?
Speaking of systemd and serial ports, there is also the damn stupid serial port getty setup that cycles between 115200, 38400, 9600 baud. That is guaranteed to waste a few minutes of your time when you come to log in on a serial port. That is a !@#$ing stupid idea. Once you understand baud rate on serial, you set it correctly, then the RPi does its stupid baud rate dance. The offending code is in /lib/systemd/system/serial-getty@.service . Apart from hacking that file, what is the proper way to tell systemd: halt and desist?
If on a Windows box, be sure the Prolific USB-to-Serial device is set to 115200, along with your PUTTY session. I had the garbled text issue on both a Rasp Pi 3 and a Rasp Pi 2. Once I changed my device speed in device manager, I was getting clear text over my serial session.
Hi,I have a problem with serial port /dev/ttyAMA0 on Jessie (Raspberry Pi 2B)During boot time it sends one byte (0xFF) to serial port which confuses the connected device (DS2480B 1-wire bus-master chip).
Running my code on a RPi 3, I had troubles with receiving data on the UART unless I added the line to lock the CPU core frequency (core_freq=250): Adding the line to enable the UART (enable_uart=1) was not enough. 2ff7e9595c