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    Linux Systems Guides
    Backup Solutions
    60 Topics
    79 Posts
    rickR
    Unable to negotiate with 10.10.1.35 port 22: no matching host key type found. Their offer: ssh-rsa,ssh-dss

    While attempting ssh this error is generally due to mismatched versions of ssh, where an up to date version is attempting to access an older version

    Add the following to your command :

    The proper way:

    ssh -o KexAlgorithms=diffie-hellman-group14-sha1 -oHostKeyAlgorithms=+ssh-dss 10.10.1.35

    The cheap way:

    Example :

    ssh -oHostKeyAlgorithms=+ssh-dss 10.10.1.35

    or ssh -oHostKeyAlgorithms=+ssh-dss user@10.10.1.35

    This can be added to the ~/.ssh/config file

    Host my-server HostName 10.10.1.35 HostKeyAlgorithms=+ssh-dss

  • FreeBSD Notes

    11 Topics
    16 Posts
    rickR

    Print command name running on port

    sudo lsof -iTCP -sTCP:LISTEN -n -P | awk 'NR>1 {print $9, $1, $2}' | sed 's/.*://' | while read port process pid; do echo "Port $port: $(ps -p $pid -o command= | sed 's/^-//') (PID: $pid)"; done | sort -n

  • Android hacks

    1 Topics
    1 Posts
    rickR

    Install adb:

    On Debian:

    sudo apt install android-tools-adb

    If your running Ubuntu:

    sudo apt install adb

    Place your Android device in Developer Mode: Go to settings > About Phone> and tap on this several consecutive times (maybe 5) You’ll see a note stating developer options have been enabled.

    Now go back to your settings, and you’ll see ‘Developer Options’

    (Make sure your connected to the machine via USB cable)

    !Go into Android developer options, and allow USB debugging

    If your Android device is attached as a camera, you’ll get a warning in the command line something to the effect of:

    adb: unable to connect for backup

    Or complaints about the fact there is nothing for the server to connect to. If so, the Android is connected as PTP and needs to be changed.

    Once the server is running, and the Android is available as a media device (MTP)

    Go to your command line and type:

    adb start-server

    Output:

    * daemon not running. starting it now on port 5037 * * daemon started successfully *

    Unlock the Android device and accept the RSA key from the machine you are running adb from. You will be asked to do so before moving further:

    Allow USB debugging? Click OK

    Now the two devices are connected.

    The command to backup all files on the Android device is as follows:

    adb backup -apk -shared -all -f my-android-backup.adb

    You can change “my-android-backup” to anything you wish, just insure the file extension is adb.

    You will be asked to create an encrypted file, if your device is not already encrypted, just type in a password you will remember!

    If your device is already encrypted, you will be required to encrypt the backup.

    The backup time will depend obviously how much you have ‘collected’ on your device, with no real vision of progress, so chill and leave it alone. ADB will quit when done.

    The backup file will be located in the user directory ( or wherever you were when you took the backup)

    To restore this backup, is just as simple, connect, and run:

    adb restore my-android-backup.adb

    Fin!

  • 1 Topics
    1 Posts
    rickR
    enable conf t int vlan1 no shut end copy run start

    Check your work

    sh ip int bri vlan1

    Output:

    Interface IP-Address OK? Method Status Protocol Vlan1 192.168.0.101 YES NVRAM up up
FreeBSD Notes
  • rickR
    rick
    Unable to negotiate with 10.10.1.35 port 22: no matching host key type found. Their offer: ssh-rsa,ssh-dss

    While attempting ssh this error is generally due to mismatched versions of ssh, where an up to date version is attempting to access an older version

    Add the following to your command :

    The proper way:

    ssh -o KexAlgorithms=diffie-hellman-group14-sha1 -oHostKeyAlgorithms=+ssh-dss 10.10.1.35

    The cheap way:

    Example :

    ssh -oHostKeyAlgorithms=+ssh-dss 10.10.1.35

    or ssh -oHostKeyAlgorithms=+ssh-dss user@10.10.1.35

    This can be added to the ~/.ssh/config file

    Host my-server HostName 10.10.1.35 HostKeyAlgorithms=+ssh-dss
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  • rickR
    rick

    Print command name running on port

    sudo lsof -iTCP -sTCP:LISTEN -n -P | awk 'NR>1 {print $9, $1, $2}' | sed 's/.*://' | while read port process pid; do echo "Port $port: $(ps -p $pid -o command= | sed 's/^-//') (PID: $pid)"; done | sort -n
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  • rickR
    rick

    Locate hard drive and get information

    ls -l /sys/block | grep sd.

    Output:

    lrwxrwxrwx 1 root root 0 Jun 22 06:28 sda -> ../devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/block/sda lrwxrwxrwx 1 root root 0 Jun 22 06:28 sdb -> ../devices/pci0000:00/0000:00:1f.2/ata2/host1/target1:0:0/1:0:0:0/block/sdb lrwxrwxrwx 1 root root 0 Jun 22 06:28 sdc -> ../devices/pci0000:00/0000:00:1f.2/ata3/host2/target2:0:0/2:0:0:0/block/sdc lrwxrwxrwx 1 root root 0 Jun 22 06:28 sdd -> ../devices/pci0000:00/0000:00:1f.2/ata4/host3/target3:0:0/3:0:0:0/block/sdd

    Or for a more detailed view

    strace -e trace=open lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS sda 8:0 0 3.6T 0 disk ├─data--2-data--2_tmeta 252:3 0 15.9G 0 lvm │ └─data--2-data--2-tpool 252:9 0 3.6T 0 lvm │ ├─data--2-data--2 252:10 0 3.6T 1 lvm │ ├─data--2-vm--101--disk--0 252:11 0 8G 0 lvm │ ├─data--2-vm--103--disk--0 252:12 0 32G 0 lvm │ ├─data--2-vm--107--disk--0 252:13 0 500G 0 lvm │ └─data--2-vm--108--disk--0 252:20 0 100G 0 lvm └─data--2-data--2_tdata 252:6 0 3.6T 0 lvm └─data--2-data--2-tpool 252:9 0 3.6T 0 lvm ├─data--2-data--2 252:10 0 3.6T 1 lvm ├─data--2-vm--101--disk--0 252:11 0 8G 0 lvm ├─data--2-vm--103--disk--0 252:12 0 32G 0 lvm ├─data--2-vm--107--disk--0 252:13 0 500G 0 lvm └─data--2-vm--108--disk--0 252:20 0 100G 0 lvm sdb 8:16 0 698.6G 0 disk └─sdb1 8:17 0 698.6G 0 part /mnt/pve/backups sdc 8:32 0 3.6T 0 disk ├─vm--data-vm--data_tmeta 252:4 0 15.9G 0 lvm │ └─vm--data-vm--data-tpool 252:14 0 3.6T 0 lvm │ ├─vm--data-vm--data 252:15 0 3.6T 1 lvm │ ├─vm--data-vm--100--disk--0 252:16 0 270G 0 lvm │ ├─vm--data-vm--102--disk--0 252:17 0 100G 0 lvm │ ├─vm--data-vm--104--disk--0 252:18 0 25G 0 lvm │ └─vm--data-vm--106--disk--0 252:19 0 32G 0 lvm └─vm--data-vm--data_tdata 252:7 0 3.6T 0 lvm └─vm--data-vm--data-tpool 252:14 0 3.6T 0 lvm ├─vm--data-vm--data 252:15 0 3.6T 1 lvm ├─vm--data-vm--100--disk--0 252:16 0 270G 0 lvm ├─vm--data-vm--102--disk--0 252:17 0 100G 0 lvm ├─vm--data-vm--104--disk--0 252:18 0 25G 0 lvm └─vm--data-vm--106--disk--0 252:19 0 32G 0 lvm sdd 8:48 0 931.5G 0 disk ├─sdd1 8:49 0 1007K 0 part ├─sdd2 8:50 0 1G 0 part └─sdd3 8:51 0 930.5G 0 part ├─pve-swap 252:0 0 8G 0 lvm [SWAP] ├─pve-root 252:1 0 96G 0 lvm / ├─pve-data_tmeta 252:2 0 8.1G 0 lvm │ └─pve-data 252:8 0 794.3G 0 lvm └─pve-data_tdata 252:5 0 794.3G 0 lvm └─pve-data 252:8 0 794.3G 0 lvm +++ exited with 0 +++ cat /proc/partitions major minor #blocks name 8 0 3907018584 sda 8 16 732574584 sdb 8 17 732572672 sdb1 8 32 3907018584 sdc 8 48 976762584 sdd 8 49 1007 sdd1 8 50 1048576 sdd2 8 51 975712967 sdd3 252 0 8388608 dm-0 252 1 100663296 dm-1 252 2 8495104 dm-2 252 3 16650240 dm-3 252 4 16650240 dm-4 252 6 3873329152 dm-6 252 5 832888832 dm-5 252 7 3873329152 dm-7 252 8 832888832 dm-8 252 9 3873329152 dm-9 252 10 3873329152 dm-10 252 11 8388608 dm-11 252 12 33554432 dm-12 252 13 524288000 dm-13 252 14 3873329152 dm-14 252 15 3873329152 dm-15 252 16 283115520 dm-16 252 17 104857600 dm-17 252 18 26214400 dm-18 252 19 33554432 dm-19 252 20 104857600 dm-20

    Locate drive by serial and model information

    hdparm -i /dev/sda /dev/sda: Model=WDC WD4000FYYZ-05UL1B0, FwRev=00.0NS05, SerialNo=WD-WCC132262513 Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0 BuffType=unknown, BuffSize=unknown, MaxMultSect=16, MultSect=off CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=7814037168 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6 AdvancedPM=yes: unknown setting WriteCache=disabled Drive conforms to: Unspecified: ATA/ATAPI-1,2,3,4,5,6,7 * signifies the current active mode
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  • rickR
    rick

    Screen recording can use webm as their format, it can be more simple to use a gif to embed into a website or forum, than adding scripts to host different video format.

    In this case I grabbed a screen record of the progress for writing zeros to a hard drive with dd

    Use ffmpeg to convert webm to gif:

    First create a pallet:

    Move into the directory which the webm is located, or type in the path

    Where ‘dd.webm’ is the screen recording

    ffmpeg -y -i dd.webm -vf palettegen palette.png

    Output:

    dd-ffmpeg.png

    Then convert the webm to gif:

    ffmpeg -y -i dd.webm -i palette.png -filter_complex paletteuse -r 10 dd.gif

    dd-webm-2.png

    This is what I ended up with, looks like any image of any alien on the interwebz, as if shot through a potato, some tweaking of the command is in my future. None the less.

    dd.gif

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  • rickR
    rick

    Write zeros to all sectors

    Use the command ‘lsblk’ to find the drive you wish to erase

    I’m using ‘dd’ to erase things

    In this case I’m torching sdb

    Only use status=progress if you care it’s not necessary

    dd if=/dev/zero of=/dev/sdb bs=12M status=progress

    dd.gif

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