howto

Note: These are my internal howto receipes, some of them might
be obsolete while others just work in my setting. If you need
help installing windrbd, please see the file INSTALL or contact
sales@linbit.com for professional support.

						- Johannes
---------------------------------------------------------------------

Building and "insmod" DRBD windows driver:

        1.) Run
                make
        on the Linux box (from $HOME/Linbit/Work/wdrbd9)

        2.) Run
                make
        on the Windows box (from $HOME/Linbit/Work/wdrbd9 (takes some while)

        3.) Run
                make install
        on the Windows box (from $HOME/Linbit/Work/wdrbd9/converted-sources/drbd)

        4.) Run (in an Administrator cmd.exe Console: to open it go to
                 C:\Windows\System32 in Explorer, Cmd-Click on cmd.exe
                 and select Run as Administrator)
                INSTALL-DRBD-admin.bat

        5.) To load the driver, do (from Adminstrator Console)
                sc start drbd
        DbgViewer will show output. To start DbgViewer go to
        C:\drbd\DebugViewer and start DbgView.exe as Administrator

from Windows to Mac:

Start -> In Text field:
\\192.168.56.1

Right click: Cmd+Click

Gruppenrichtline: Start, type Gruppenrichtlinie

search cmd.exe - right click (Cmd+click) and select run as administrator

then 
pnputil -a drbd.inf

eventvwr linbit-wdrbd

DebugView

	C:\drbd\dbgview\DbgView.exe as Administrator

---
List physical (also non partitioned) drives:

wmic diskdrive list 
wmic diskdrive list brief

---
Reconnect z: (/home/johannes/Linbit on Ubuntu 14.03 machine):

net use z:

---

partition manager:

System und Sicherheit / Verwaltung / Festplattenpartitionen erstellen und formatieren

---

BSOD:

codes at https://www.lifewire.com/blue-screen-error-codes-4065576
1 Memory referenced
2 IRQL at time of reference
3 0: Read 1: Write 8: Execute
4 Address that referenced memory

----
Disable checksum offloading:

sudo ethtool -K eth1 rx off
sudo ethtool -K eth1 tx off

----

Resolve split brain:

sudo drbdadm connect --discard-my-data w0

jt/fix-multipage-io

Linux invalidate read cache (sync does push write cache)
sudo blockdev --flushbufs /dev/drbd26
sudo blockdev --flushbufs /dev/sdb1

Windows self extracting EXE generator:

iexpress.exe

device          minor 5 name "C:\\foo\\bar";
device          minor 5 name "H:";

drbd_sender.c:make_resync_request()

----

Make versioninfo work:

change path specs in .git file (not dir) in submodules to
relative path.

----

Sign with Linbit certificate (now integrated in Makefile, ignore this
section):

copy unsigned drbd.sys and drbd.cat to Windows 10: C:\to-sign

"C:\Program Files (x86)\Windows Kits\10\bin\10.0.16299.0\x64\signtool.exe" sign /v /ac "C:\cert\DigiCert High Assurance EV Root CA.crt" /a /t http://timestamp.digicert.com "c:\to-sign\drbd.cat"

"C:\Program Files (x86)\Windows Kits\10\bin\10.0.16299.0\x64\signtool.exe" sign /v /ac "C:\cert\DigiCert High Assurance EV Root CA.crt" /a /t http://timestamp.digicert.com "c:\to-sign\drbd.sys"

copy files back to $LINBIT_COMPILE_DIR/signed

Use windrbd-install-signed.SED.in to build package (will take drbd.sys and
	drbd.cat from signed directory).

-----

Make releases
-------------
Update: Driver signing has changed. We use Microsoft partner
center and HLK Studio to obtain a Microsoft signature, this
makes WinDRBD also load on SecureBoot systems. So most of
the following can be ignored.

Update: can now be built with Windows 10 physical machine, which
makes everything much more easy.

Run cygwin update
Update cygwin1.dll to newest version (in inno-setup/cygwin-binaries)

git checkout master
git merge jt/latest-feature-branch

On Linux:
make clean && make V=1
	And check in converted-sources if source changed (git diff)

Document changes in WHATSNEW.md

Add entry to README.md
git add README.md
git commit -m "Release 1.0.X"
git tag windrbd-1.0.X
git describe --tags
	(should display the version number)

build drbd-utils-windows (make package takes drbdadm, ... from build dir)

On Windows 10 physical machine (with USB dongle attached):
mount ewdk (double click EWDK_rs5_... ISO on Desktop)
make clean && make package R=1

upload install-windrbd-1.0.X-signed.exe to google drive windrbd-in folder
git push --all origin
git push --tags origin

phil:
git push master github
git push master github --tags
copy signed exe to website

johannes:
EMail to drbd-user@lists.linbit.com

-----

Upgrade DRBD

cd drbd
git checkout drbd-9.0
git pull
git checkout <hash of version msg is prepare ...>
cd drbd/drbd-headers
git checkout master
git pull
git submodule update
cd ..
git commit -a

and adapt patches to new version.

----

Partitionieren:

Windows+R:
diskmgmt.msc

----
Delete NTFS partition

dd if=/dev/zero of=/dev/sdXY bs=512 count=1
/dev/sd muss stimmen!! Achtung bei alten windows versionen aendert sich
das zwischen reboots.

-----
Disconnect network share:

net use y: /delete
-----

View Generic Script Failover Clustering logs:

Event Viewer (Start / Windows Administrative Tools / EventViewer)
In the tree, select:
Event Log / Applications and Services Log / Microsoft / Windows / Failover Clustering / Diagnostics

-------

make new windows boot menu entry:

bcdedit /copy {default} /d "DRBD"

bcdedit /enum all

-----

Diskless client over TCP/IP

When booting directly (image mounted as disk): remove windrbd.sys driver:

cd Linbit/tmp
sudo mount /dev/sdf2 mnt/
rm mnt/Windows/System32/drivers/windrbd.sys
sudo umount mnt

Installing driver via Linux:

cd Linbit/tmp
sudo mount /dev/sdf2 mnt/
cp ../windrbd/converted-sources/drbd/windrbd.sys mnt/Windows/System32/drivers/windrbd.sys
sudo umount mnt

(or:
cp ../inf-files/windrbd-bootc.sys mnt/Windows/System32/drivers/windrbd.sys 
)

(does not touch registry)

# create a small text file to make sure it is the right image:

# copy con xxx.txt
# 123^Z

sudo chmod o+rw /dev/sdf
sudo drbdadm up tiny-windows-disk
# adjust IP address of peer in DRBD config:
sudo vi /etc/drbd.d/tiny-windows-boot.res 
sudo drbdadm up tiny-windows-boot 
sudo drbdadm up tiny-windows-system

# linux: 
# nc -p 5000 -l -k | tee /tmp/ipxe.log

Power on Diskless Client VM
Press Ctrl-B to interrupt iPXE
dhcp net1
boot http://192.168.56.102/~johannes/ipxe/ipxework.pxe

Press Ctrl-B again
dhcp net1
sanboot http://192.168.56.102/cgi-bin/drbd.cgi

-----

Build ipxe

make DEBUG=drbd && cp bin/ipxe.pxe ~/public_html/ipxe/ipxework.pxe
# make DEBUG=sanboot,int13,httpcore:2,httpblock,blocktrans:2,xfer,xferbuf && cp bin/ipxe.pxe ~/public_html/ipxe/ipxework.pxe

# 64 bit version can boot 32 GB images
make bin-x86_64-pcbios/ipxe.pxe 

# Use this from now on:
make && cp bin/ipxe.pxe ~/public_html/ipxe/ipxework.pxe

iPXE is configured via header files in src/config

make DEBUG=ibft:3,iscsi:3
sudo cp bin/ipxe.pxe /var/www/html/ipxe/ipxe-iscsi.pxe 

make DEBUG=ibft:3,iscsi:3,int13:3,drbd:3

make DEBUG=ibft:3,drbd:3

-----

Windows Server 2016: empty password: Start->Windows Verwaltungstools->Lokale Sicherheitsrichtlinie->Kontorichtlinien->Kennwortrichtlinien->Alter auf 0, Komplexit ausschalten.

-----

Change hostname

sysdm.cpl → Computer Name → Change → More... has a "Primary DNS suffix" option, which might be helpful here.

(and reboot)
--------

Disable automatic upgrades on Ubuntu:

 $ sudo -e /etc/apt/apt.conf.d/10periodic
Add line:
APT::Periodic::Unattended-Upgrade "0";

-------

Enable kernel serial console logging

vi /etc/default/grub 
GRUB_CMDLINE_LINUX="console=ttyS0,38400n8"
sudo update-grub
sudo reboot

And log /dev/pts/X on much/vamp to file (Simon)

----------

Dump memory from virtual box VM:

/usr/local/bin/vboxmanage debugvm "WinDRBD 2" dumpvmcore --filename Win7Lockup.elf

Then look for SPINLOCK:

strings Win7Lockup.elf | grep SPINLOCK -A 5 | tee spinlocks-win7.txt

-----

Dump memory from DisklessClient (has a terminating space):

/usr/local/bin/vboxmanage debugvm {d3dc244a-ad1f-47c2-a774-7bf04576541d} dumpvmcore --filename DisklessBootNoRootDevice.elf

-----

Enable driver verifier:

verifier /standard /driver windrbd.sys

-------

Installing and configuring DHCP server (Ubuntu)

sudo apt-get install isc-dhcp-server
(sudo apt-get -o Acquire::ForceIPv4=true install isc-dhcp-server)

sudo vi /etc/dhcp/drbdd.conf

Add:

The options from 
http://ipxe.org/howto/dhcpd#pxe_chainloading

And further down:

# solution works 'for me'. It tests for iSCSI, where sanboot http://...
# is sufficient. iscsi seems to be closely related to sanboot. The
# off the shelf VirtualBox iPXE build does not have iscsi enabled,
# therefore we load a custom built image which then executes the
# sanboot command.
if exists ipxe.iscsi {
        filename "";
        option root-path "http://192.168.56.102/cgi-bin/drbd.cgi";
} else {
        filename "http://192.168.56.102/~johannes/ipxe/ipxework.pxe";
}

Also add windrbd-root option:

option ipxe.windrbd-root code 196 = string;

After changes restart dhcp server with

sudo service isc-dhcp-server restart

DisklessClient should now boot into windows without need to type
boot commands.

Configure fixed IP Address:

host diskless-client {
        hardware ethernet 08:00:27:b2:a9:32;
        fixed-address 192.168.56.150;
}

Configure dynamic range (don't do this, DRBD needs a fixed address):

subnet 192.168.56.0 netmask 255.255.255.0 {
        range 192.168.56.160 192.168.56.250;
}

Not sure yet how it works with 2 networks (iPXE of VirtualBox seems
not to try the second network if something with the first network
fails, however this works with the custom built iPXE)

To make dhcp work the network adapter must be allowed promiscious
mode (see advanced settings of network adapter in VirtualBox network
adapter settings).
-------

Disable page file with Windows (captions may differ I have a German
Windows):

Open cmd.exe as Administrator

SystemPropertiesAdvanced.exe

Then under Advanced Tab click the Performance button (topmost)

Then under Advanced Tab / Virtual Memory / No page file

----

Avoid chmod of /dev/sdf:

Add www-data user to group disk

Or better add an extra group for drbd devices and use udev(?) to
control the device node.
-----

Temporary format of 'drbd' URI: no colons since they are used by
IPv6 addresses.

drbd:<res>;<proto>;<num-nodes>;<my-ip>;<my-minor>;<my-volume>;<peer-name>;<peer-node-id>;<peer-address>

----

Build documentation:

make tech-guides-pdf-finalize-docker

View documentation
evince tech-guides/output-pdf/windrbd.pdf 

-----

Booting

See the tech-guide on booting

Neccessary steps:

Install WinDRBD Bus driver
	Device manager: add legacy hardware: windrbd.inf

Install WinDRBD Disk driver
	(else will not call START_DEVICE PnP request)
	To do so install windrbd with boot device and wait for
	primary disabled and do Update driver software in
	device manager (windrbd-disk.inf).

	Do a drbdadm up of a dummy device (does not need to
	have backing storage or connection)

	TODO: Maybe it is also possible to just doubleclick the
	inf file which makes things far more easier.

Install windrbd driver with boot and wait for primary in
	windrbd I/O requests (not windrbd_pnp, but windrbd_create)

# Also: Disable UDP logging (NO_NET_PRINTK) in printk-to-syslog

Enable NIC driver
	E1 something for my VirtualBox

Enable AFD driver (unclear if really needed)

Enable Broadcom drivers (unclear if really needed)

Currently: Assign a fixed IP address (must match the one in DRBD
	config). TODO: which driver to load on boot to make
	DHCP work?

Also Disable Network Discovery (else there is a short time gap
	in which network is down and Windows needs to access
	boot device in order to continue):

	(from https://social.technet.microsoft.com/Forums/en-US/675520ed-fe25-455e-a86e-fdb833903b10/windows-takes-an-exceptionally-long-time-to-establish-a-network-connection-after-booting

	Control Panel\Network and Internet\Network and Sharing Center\Advanced sharing settings

	Turn OFF network discovery

Disable NDIS lightweight filter for boot NIC:

	https://support.microsoft.com/en-us/help/976042/windows-may-fail-to-boot-from-an-iscsi-drive-if-networking-hardware-is

	Not clear if that really helps .. still there is a 90 seconds
	(at least) delay.

----

Windows 10: to access network share as guest:
Windows-R gpedit.msc
Computer Configuration -> Administrative Templates -> Network -> Lanman Workstation Enable insecure guest logons Set to Enabled and click Ok


-----

Windbg:

Connect Windows VMs via host pipe serial port.

On target (see https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/setting-up-a-null-modem-cable-connection)

bcdedit /debug on
bcdedit /dbgsettings serial debugport:1 baudrate:115200

Start windbg on debug host (it crashes on connect, just restart
it with Kernel debug ... (Ctrl-K)) after it crashed, then it should
connect.

File -> Symbol search path (net use y: \\192.168.56.102\Linbit):
srv*;Y:\windrbd\windrbd\src;Y:\windrbd\converted-sources\drbd

srv*;Y:\windrbd-debug\win4lin\src;Y:\windrbd-debug\converted-sources\drbd

srv*;Y:\windrbd-backing-dev-cache\windrbd\windrbd\src;Y:\windrbd-backing-dev-cache\windrbd\converted-sources\drbd

srv*;Y:\windrbd-1.0.0-rc13-45\windrbd\src;Y:\windrbd-1.0.0-rc13-45\converted-sources\drbd

srv*;Y:\windrbd-1.1-branch\windrbd\windrbd\src;Y:\windrbd-1.1-branch\windrbd\converted-sources\drbd

srv*;Y:\windrbd-32bit-server2003\windrbd\windrbd\src;Y:\windrbd-32bit-server2003\windrbd\converted-sources\drbd

srv*;Y:\windrbd-1.1.6\windrbd\windrbd\src;Y:\windrbd-1.1.6\windrbd\converted-sources\drbd

Set the homedir:

!homedir C:\Windows\Temp

(and redo .reload to load symbols from server)

Very useful:

!stacks

List all thread contexts.

.thread fffxxxxxxx

Switch context to thread (number displayed in !stacks)

then 
k
will display the new thread's backtrace.

print C expression

?? x

Force load of mismatched PDB:

.reload /i /f /v windrbd.sys

search memory

s -a 0xfffff804`11746100 0xfffff804`11846100 "RtlZ"

-----

netsh:

Turn off firewall:

NetSh Advfirewall set allprofiles state off

Check status:

Netsh Advfirewall show allprofiles

# Turn off firewall in Windows PE:

wpeutil disablefirewall

-----

kpartx -a /dev/drbdN
	creates a /dev/dm-X for each partition on /dev/drbdN 
	those then can be mounted like any other disk.

kpartx -d /dev/drbdN
	removes /dev/dm-X for each partition on /dev/drbdN 
	needed before drbdadm down.

Document this is some user's guide.
----
iISCSI:

sudo apt-get install istgt
copy config files from /usr/share/doc/istgt/examples/
gunzip istgt.cont

dd if=/dev/zero of=filename bs=1024 size=$[ 50*1024 ]

edit in /etc/istgt/istgt.conf
PortalGroup1 IP Address
InitiatorGroup1 Netmask
LogicalUnit1 Storage (filename and size)

sudo istgt -D
sudo istgt -D -t all

sudo apt-get open-iscsi
sudo iscsi_discovery 192.168.56.102

sudo iscsistart -i test -t iqn.2007-09.jp.ne.peach.istgt:disk1 -g 1 -a 192.168.56.102

sudo iscsiadm -m node -T iqn.2007-09.jp.ne.peach.istgt:disk1 -p 192.168.56.102:3260

sudo iscsiadm -m node -T iqn.2007-09.jp.ne.peach.istgt:disk1 -p 192.168.56.102:3260 --login

Then /dev/sdm exists: can mount it:

sudo mount /dev/sdm mnt

sudo iscsiadm -m node -T iqn.2007-09.jp.ne.peach.istgt:disk1 -p 192.168.56.102:3260 --logout
----
iSCSI via iPXE:

dhcp net0
sanboot -k iscsi:192.168.56.102::::iqn.2007-09.jp.ne.peach.istgt:disk1
# sanboot iscsi:192.168.56.102::::iqn.2007-09.jp.ne.peach.istgt:disk1
# sanboot iscsi:192.168.56.102:::1:iqn.2007-09.jp.ne.peach.istgt:disk1

----

clone vdi:

vboxmanage clonevdi '/Volumes/Linbit WDRBD/Linbit/WinDRBDNew2019/Snapshots/{b83d7f0d-2a91-49be-b876-bed6fb3fe20e}.vdi' ./WinDRBDRemoteBoot/WinDRBDRemoteBoot.vdi

Where the source is the latest snapshot VDI.

-----

debugger load symbols:

.reload /i windrbd.sys

forces symbols that do not match (they match but WinDbg thinks they don't
match).
-------
Create failover cluster (Windows HA)

https://docs.microsoft.com/en-us/windows-server/failover-clustering/create-failover-cluster#install-the-failover-clustering-feature

Active Domain: 

https://www.whitewinterwolf.com/posts/2017/09/26/how-to-create-an-active-directory-domain/

In the Server Manager (it should automatically open when opening a session, otherwise it can be found in the Start menu), click on Add roles and features, and enable both Active Directory Domain Services and DNS Server roles.

Once the new roles have been installed, you must promote the server as a Domain Controller. On the top bar of the Server Manager you should see a warning sign (➀), click on it then on the Promote this server to a domain controller link (➁).

Must configure DNS when adding Computers to domain (Windows uses DNS to find
the Domain Controller). (Adapter Settings / IPv4 Properties)

------

https://answers.microsoft.com/en-us/windows/forum/windows_10-update/can-i-disable-updates-using-windows-10-enterprise/1b4bb42d-355f-41f7-9954-8b2a78a4debc

 Windows 10 Enterprise includes advanced options for disabling Windows Updates.


Press the Windows key + R then type gpedit.msc and click OK.
Go to Computer Configuration > Administrative Templates > Windows Components > Windows Update.
Double-click Configure Automatic Updates.
Select Disabled in Configured Automatic Updates on the left, and click Apply and OK to disable the Windows automatic update feature. 

--------

Find ethernet address:

virsh dump-xml <domain>

plug/unplug network cable:

virsh domif-setlink meine-windoof-vm de:ad:ba:ba:06:66 down

---------

create large backing devices (up to 512? tb):

VBoxManage createhd --filename 64tb-win10-diskless-boot.vdi --size $[ 64*1024*1024 ] --format VDI --variant Standard

---------

Install DigiCert SafeNetAuthentication Client:

https://www.digicert.com/kb/code-signing/safenet-client-installation.htm

------

From support chat:

https://www.digicert.com/StaticFiles/SafeNetAuthenticationClient-x64.msi
2:24
https://www.digicert.com/StaticFiles/SafeNetAuthenticationClient-x32.msi

Few things to note:
1) Make sure you are not on a Virtual Machine or remote accessing the device you are installing the token.
2) With the token plugged into the device go to Device manager and uninstall all Aladdin, Rainbow Microsoft USBCCID, Safenet and the USB token under “Universal Bus Controllers” and any related categories ("Smart Card Readers").
3) Unplug Token.
4) Uninstall Safenet drivers from the programs.
5) Reboot the device
6) Reinstall the latest Safenet drivers as administrator.
7) Re plug in token.

-------------------
From: 

https://www.tenforums.com/tutorials/69012-enable-disable-bsod-automatic-restart-windows-10-a.html

Disable reboot after blue screen.

Press the Win + R keys to open Run, type SystemPropertiesAdvanced.exe into Run, and click/tap on OK to open advanced System Properties.

Click/tap on the Settings button under Startup and Recovery

Check (enable - default) or uncheck (disable) the Automatically restart box under System failure for what you want, and click/tap on OK.

-----------------------

Run a test from testsuite:

./run.py wintestubuntu linbit-wdrbd-2020 -r resize

right now fails because lvs does not exist on cygwin.

-------------------------

Control firewall: enable IPv4 pings:

netsh advFirewall Firewall add rule name="OSRadar Rule PING IPv4" protocol=icmpv4:8,any dir=in action=allow

------------------------

Install HLK controller:

Make a snapshot
Must be an English Server 2016
Download file: make sure it is the version for Windows Server 2016
Run as Administrator

Revert to snapshot if installation failed (else a follow up
	installation will fail).

-----------------------

Allow a port from command line:

netsh advfirewall firewall add rule name=test1 protocol=tcp dir=in localport=5000 action=allow

------------------------

DigiCert change password:

https://www.digicert.com/kb/code-signing/ev-code-signing-secure-token-set-up.htm

------------------------

Make mouse work:

Goto Windows Contol Panel / Mouse Properties / Pointer Options / Enhance Pointer Precision
Or Settings / Mouse / Additional Mouse Options / Pointer Options / Enhance Pointer Precision
Uncheck it and click Apply

------------------------

Howto disable automatic updates in Server 2016:

open cmd
sconfig
press 5<enter>
press m<enter>
press 15<enter> to exit sconfig

---------------------------

Howto disable Internet Explorer safety checks:

Close all IE Windows.
Open Server Manager / Local Machine / Internet explorer safety (or so) turn off.

----------------------------

socat via network:

on one node (example vamp.linbit):
socat /dev/pts/1,raw,echo=0,crnl TCP4-LISTEN:5567,crnl,forever

on other node:
socat /dev/pts/2,raw,echo=0,crnl TCP4:vamp.linbit:5567,crnl,forever

----------------------------

How to show parameters of BSOD crash (Windows 10 / Server 2016 and 2019)

    Windows 10 disable bsod smiley

    Open the Registry editor.
    Navigate to the following registry key:

    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\CrashControl

    Tip: See how to open the desired registry key with one click.
    Create a new DWORD value named DisplayParameters and set to 1.

-----------------------------

DRBD manpage

man /home/johannes/Linbit/drbd-utils-build-manpages/drbd-utils/documentation/v9/drbd.conf.5

-----------------------------

Build drbd on Ubuntu Linux:

Need cocci must build cocci from source (for most distros)

# Ubuntu 16.04:
sudo apt install pkg-config ocaml-native-compilers ocaml-findlib menhir libmenhir-ocaml-dev libpcre-ocaml-dev libparmap-ocaml-dev
# Ubuntu 18.04:
sudo apt-get install pkg-config ocaml-native-compilers ocaml-findlib menhir libmenhir-ocaml-dev libpcre-ocaml-dev libparmap-ocaml-dev libncurses5-dev ocaml-base-nox-4.05.0 ocaml-interp dpkg-dev libdpkg-perl libfindlib-ocaml ocaml-compiler-libs libparmap-ocaml-7sma4 libpcre-ocaml-2h5n2 linux-headers-4.15.0-141 linux-modules-4.15.0-141-generic libtinfo-dev

git clone https://github.com/coccinelle/coccinelle.git
cd coccinelle
git checkout 1.0.8
./autogen
./configure
make
sudo make install
cd ..
git clone --recursive https://github.com/LINBIT/drbd.git
cd drbd
make
sudo make install

-------------

Howto tar without old installers (they take 2GB meanwhile):

tar cfz windrbd-1.0.0.rc16.tar.gz windrbd --exclude=install*.exe 

--------------

Howto update cygwin binaries:

cd inno-setup/cygwin-binaries
for i in * ; do cp `which $i` . ; done

----------------

Network debugging:

On target computer: (Must do this everytime for each debug session)

Administrator@win02 /cygdrive/f/Program Files/Windows Kits/10/Debuggers/x64
$ ./kdnet 192.168.74.1 50000

Enabling network debugging on Intel(R) PRO/1000 MT Network Connection.
Manage-bde.exe not present.  Bitlocker presumed disabled.

To debug this machine, run the following command on your debugger host machine.
windbg -k net:port=50000,key=t4kmmq9hibab.dq0ex0dbg0d4.3czg54idmf6fr.31v3hnule3b
3i

Then reboot this machine by running shutdown -r -t 0 from this command prompt.

windbg -k net:port=50000,key=t4kmmq9hibab.dq0ex0dbg0d4.3czg54idmf6fr.31v3hnule3b3i
windbg -k net:port=50000,key=t4kmmq9hibab.dq0ex0dbg0d4.3czg54idmf6fr.31v3hnule3b3i

New key:
./windbg -k net:port=50000,key=3lpt1rb2i2bk.st9arsvxn17s.4a1zuzyjj9ts.138h5jxsk3slg

Server 2016 VMs:
./windbg -k net:port=50000,key=340y3z0bxwz4a.1cu44q9m1w02m.jiwlyjmzhhzs.17py80bu9e99r
./windbg -k net:port=50000,key=340y3z0bxwz4a.1cu44q9m1w02m.jiwlyjmzhhzs.17py80bu9e99r

!! disable firewall or at least allow port (but most likely UDP it didn't work
   with TCP !!

windbg -k net:port=50001,key=2bk3901yipjbz.3qxt07itly92e.2uwuwqzmrvhkg.2v7kvjtmzce9d

If there are more hosts to be debugged on the same network the port numbers
must differ (for example 50000 for a and 50001 for b). Then two hosts can
net debug each other ...

windbg -k net:port=50001,key=1wjw9rosga3jy.p1udlipefkas.u2pwjrtgy1g4.rxx8mttfmsdk

HLK client (from server 2019 datacenter jaenner 3)

windbg -k net:port=50000,key=2z1io9ycxxh2v.emxijaabaq01.spzt9bxb3lyc.3smqj0injt3d6


# New in June 2022:
'/cygdrive/e/Program Files/Windows Kits/10/Debuggers/x64/kdnet.exe' 192.168.77.2 50000

netsh advfirewall firewall add rule name=test1 protocol=udp dir=in localport=50000 action=allow
netsh advfirewall firewall add rule name=test1 protocol=tcp dir=in localport=50000 action=allow

windbg -k net:port=50000,key=2d7c6ijqer5sh.2i4twokqtuaj2.175m5lbeohllp.2gmbkv8c8
8r1o

10.43.224.48 (from 10.43.224.32):
windbg -k net:port=50001,key=1x44vmzro2dc4.1idcsmmecsg50.34pdqj7eo7pj9.22ocd7148g8qw
-----

Install HLK Client

net use w: '\\10.43.6.194\HLKInstall'
w:
cd Client
set TEMP='C:\Windows\Temp'
set TMP='C:\Windows\Temp'
setup.cmd

Open TCP/IP Port 1771 (or disable firewall)

------

Device mapper delay target:

echo "0 `blockdev --getsz /dev/mapper/slow_green-jt--delay--backingdev` delay /dev/mapper/slow_green-jt--delay--backingdev 0 500" | dmsetup create delayed

------

Cygwin for ReactOS:

https://morganwu277.github.io/2017/06/04/Setup-Cygwin-in-Windows-XP-2003/
start setup with -X from command line (ignores signatures (*.sig) which do
not exist in the archive. Then use 
http://ctm.crouchingtigerhiddenfruitbat.org/pub/cygwin/circa/2016/08/30/104223
as mirror (must have to add it manually)

------

Start Windows 2003 32 bit build env (must install WinDDK 7.1 from Microsoft
homepage):

cmd /k 'C:\WinDDK\7600.16385.1\bin\setenv.bat C:\WinDDK\7600.16385.1\ fre x86 WNET'

--------

Disable Screen blanking:

powercfg.cpl
then Change Plan settings / Turn off the display to Never and Save changes

--------

Disable prompt for trusting Linbit:

certutil -addstore "TrustedPublisher" linbit-trusted-cert.cer

-------

Run task on system startup:

schtasks /create /sc ONSTART /tn WinDRBD\StartHLKTest /tr C:\WinDRBD\starthlk.ba
t /ru system

schtasks /create /sc ONSTART /tn WinDRBD\CloudInitFake /tr C:\WinDRBD\cloudinitfake.bat /ru system

# or from bash:
schtasks /create /sc ONSTART /tn WinDRBD\\CloudInitFake /tr C:\\WinDRBD\\cloudinitfake.bat /ru system

be sure to set the path in the cmd file first:

set PATH=C:\cygwin64\usr\local\bin;C:\cygwin64\bin;C:\cygwin64\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;C:\Windows\System32\OpenSSH;C:\Program Files\WinDRBD;C:\WinDRBD\usr\sbin;C:\WinDRBD\usr\bin;C:\WinDRBD\bin;C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\WindowsApps

or so ...

---------------

Add swapspace to a Linux machine:

johannes@jt-ubuntu2021C:~$ sudo fallocate -l 16G /swapfile
johannes@jt-ubuntu2021C:~$ sudo chmod 600 /swapfile
johannes@jt-ubuntu2021C:~$ sudo mkswap /swapfile
Setting up swapspace version 1, size = 16 GiB (17179865088 bytes)
no label, UUID=fd5e0600-3335-47e7-b51f-4de2c227fc5d
johannes@jt-ubuntu2021C:~$ sudo swapon /swapfile
johannes@jt-ubuntu2021C:~$ htop
johannes@jt-ubuntu2021C:~$ vi /etc/fstab
johannes@jt-ubuntu2021C:~$ sudo vi /etc/fstab
(add line:
/swapfile               none    swap    sw              0 0
johannes@jt-ubuntu2021C:~$ htop
johannes@jt-ubuntu2021C:~$ sudo reboot

---------

pull and check out submodules:

edit github URLS in .git/config (change git: to https:)

git submodule update --checkout --init --recursive

(probably better to edit .gitmodules ...)
----------

Run a shell script as a Windows Service:

cygrunsrv -I demoservice -t manual -p /bin/bash -a '-c /home/Administrator/myservice.sh'

----------
Grep resolved TODOs:

grep ^[A-SW-Z][a-z]*: TODO

---------
Enable/Disable an existing firewall rule:

netsh advfirewall firewall set rule name="LINSTOR Port 7003" new enable=yes
netsh advfirewall firewall set rule name="LINSTOR Port 7003" new enable=no

Dump firewall rule:

netsh advfirewall firewall show rule name="LINSTOR Port 7003"
-----
add/delete/show an extra IP address ('cluster IP')

netsh interface ipv4 add address "Ethernet 4" 10.43.224.99
netsh interface ipv4 delete address "Ethernet 4" 10.43.224.99
netsh interface ipv4 show address