SSH: X11 Forwarding

Connect

ssh -YC <host>

KDE QT5 themes

On client

.ssh/config

Host orion # orion
        HostName orion.giran.cyou
        User liannnix
        SetEnv XDG_CURRENT_DESKTOP=kde

On server

/etc/openssh/sshd_config

AcceptEnv XDG_CURRENT_DESKTOP

BTRFS

Создание RAID1 из уже существующей ФС

btrfs dev add /dev/sda1 /
btrfs balance start -dconvert=raid1 -mconvert=raid1

HDD speed test

dd if=/dev/zero of=test1.img bs=5G count=1 oflag=dsync && rm -rf test1.img

Dogtag

Установка

apt-get install pki-base pki-ca pki-server dogtag-pki-server-theme

Инициализация

pkispawn

Ипортирование сертификата администратора

pki pkcs12-import --pkcs12 ~/.dogtag/pki-main/ca_admin_cert.p12 --password-file pass.txt
pki client-cert-import --pkcs12 ~/.dogtag/pki-main/ca_admin_cert.p12 --pkcs12-password-file pass.txt

GIT

Worktree

git worktree

Blame

git blame

Ours strategy

git merge -s ours

Empty branch

git switch --orphan <branch>

From srpm to gear migration hack

git merge --no-commit --allow-unrelated-histories  -s ours <upstream-tag>
git read-tree -u --reset <upstream-tag>
git checkout @ -- .gear package.spec
git commit -a

Chunked add

git add -p

See only my commits

git log --first-parent

GlusterFS

Установка пакетов

apt-get install glusterfs9 glusterfs9-server

Включение и запуск сервисов

systemctl enable --now glusterfssharedstorage.service
systemctl enable --now glusterd.service

Добавление пиров (node)

gluster peer probe sora.giran.cyou

Создание тома

gluster volume create data replica 3 sora.giran.cyou:/srv/data/brick jarvis.giran.cyou:/srv/data/brick yun.giran.cyou:/srv/data/brick

Монтирование тома

Интерактивное

mount.glusterfs sora:/data /mnt/data/ -o acl

Через fstab

sora.giran.cyou:/data   /mnt/data       glusterfs       acl     0       0

Запуск glusterd после инициализации сети

systemctl edit glusterd.service

[Unit]
After=network-online.target
Before=

Статус

gluster volume status data

Показать файлы, которым требуется восстановление

gluster volume heal sysvol info

Восстановить данные в томе

gluster volume heal

LXC cheat sheet

Autostart network listening service

*/2 * * * * /usr/bin/host -W 5 ya.ru 192.168.20.53 2>&1 > /dev/null || /usr/bin/systemctl restart bind

Update PTR record

nsupdate -g

server giran.cyou
update delete 10.254.168.192.in-addr.arpa. PTR
update add 10.254.168.192.in-addr.arpa. 300 PTR yun.giran.cyou.
send
quit

echo -e 'server giran.cyou\n update delete 10.254.168.192.in-addr.arpa. PTR\n update add 10.254.168.192.in-addr.arpa. 300 PTR yun.giran.cyou.\n send\n quit
' | nsupdate -g

realm GIRAN.CYOU
update delete 10.254.168.192.in-addr.arpa. in PTR
update add 10.254.168.192.in-addr.arpa. 3600 in PTR yun.giran.cyou.
send
realm GIRAN.CYOU
update delete 7.2.b.0.f.b.e.f.f.f.e.7.d.1.4.a.a.0.0.0.3.0.0.1.0.4.8.e.2.0.a.2.ip6.arpa. in PTR
update add 7.2.b.0.f.b.e.f.f.f.e.7.d.1.4.a.a.0.0.0.3.0.0.1.0.4.8.e.2.0.a.2.ip6.arpa. 3600 in PTR yun.giran.cyou.
send

OpenSSL

show cert info

openssl x509 -in cert.pem -noout -text

OpenVSwitch

add port and physical interface

ovs-vsctl add-port trunk vlv4ttk_v4ttk tag=201 -- set interface vlv4ttk_v4ttk type=internal

KRB5: pkinit

KDC

openssl genrsa -out cakey.pem 2048
openssl req -key cakey.pem -new -x509 -out cacert.pem

vim extensions.kdc

[kdc_cert]
    basicConstraints=CA:FALSE
    keyUsage=nonRepudiation,digitalSignature,keyEncipherment,keyAgreement
    extendedKeyUsage=1.3.6.1.5.2.3.5
    subjectKeyIdentifier=hash
    authorityKeyIdentifier=keyid,issuer
    issuerAltName=issuer:copy
    subjectAltName=otherName:1.3.6.1.5.2.2;SEQUENCE:kdc_princ_name

[kdc_princ_name]
    realm=EXP:0,GeneralString:${ENV::REALM}
    principal_name=EXP:1,SEQUENCE:kdc_principal_seq

[kdc_principal_seq]
    name_type=EXP:0,INTEGER:2
    name_string=EXP:1,SEQUENCE:kdc_principals

[kdc_principals]
    princ1=GeneralString:krbtgt
    princ2=GeneralString:${ENV::REALM}

openssl genrsa -out kdckey.pem 2048
openssl req -new -out kdc.req -key kdckey.pem
export REALM=DOMAIN.ALT
openssl x509 -req -in kdc.req -CAkey cakey.pem -CA cacert.pem -out kdc.pem -extfile extensions.kdc -extensions kdc_cert -CAcreateserial
cp kdc.pem /var/lib/kerberos/krb5kdc/
cp kdckey.pem /var/lib/kerberos/krb5kdc/
cp cacert.pem /var/lib/kerberos/krb5kdc/

vim /var/lib/kerberos/krb5kdc/kdc.conf

[kdcdefaults]
    ...
    pkinit_identity = FILE:/var/lib/kerberos/krb5kdc/kdc.pem,/var/lib/kerberos/krb5kdc/kdckey.pem
    pkinit_anchors = FILE:/var/lib/kerberos/krb5kdc/cacert.pem

[realms]
    DOMAIN.ALT = {
    ...
    default_principal_flags = +preauth
}

kadmin.local -q 'addprinc test'
kadmin.local -q 'modprinc +requires_preauth test'
kadmin.local -q 'addprinc -randkey WELLKNOWN/ANONYMOUS'

vim extensions.client

[client_cert]
    basicConstraints=CA:FALSE
    keyUsage=digitalSignature,keyEncipherment,keyAgreement
    extendedKeyUsage=1.3.6.1.5.2.3.4
    subjectKeyIdentifier=hash
    authorityKeyIdentifier=keyid,issuer
    issuerAltName=issuer:copy
    subjectAltName=otherName:1.3.6.1.5.2.2;SEQUENCE:princ_name

[princ_name]
    realm=EXP:0,GeneralString:${ENV::REALM}
    principal_name=EXP:1,SEQUENCE:principal_seq

[principal_seq]
    name_type=EXP:0,INTEGER:1
    name_string=EXP:1,SEQUENCE:principals

[principals]
    princ1=GeneralString:${ENV::CLIENT}

openssl genrsa -out clientkey.pem 2048
openssl req -new -key clientkey.pem -out client.req
export REALM=DOMAIN.ALT
export CLIENT=test
openssl x509 -CAkey cakey.pem -CA cacert.pem -req -in client.req -extensions client_cert -extfile extensions.client -days 365 -out client.pem
scp cacert.pem test@10.64.172.150:
scp client.pem test@10.64.172.150:
scp clientkey.pem test@10.64.172.150:
systemctl restart krb5kdc.service

KCLW

cp /home/test/*.pem /var/lib/kerberos/krb5/

vim /etc/krb5.conf

[libdefaults]
    ...
    pkinit_anchors = FILE:/var/lib/kerberos/krb5/cacert.pem
    #pkinit_identities = FILE:/var/lib/kerberos/krb5/client.pem,/var/lib/kerberos/krb5/clientkey.pem

Register DNS entry for joined machine

/usr/bin/net ads dns register --use-kerberos=required --use-krb5-ccache=FILE:/tmp/ccach pki.giran.cyou

DFS

Samba Wiki: DFS

smb.conf

[global]
	<...>
	host msdfs = yes
[share]
	#vfs objects = dfs_samba4
	path = /export/dfsroot
	msdfs root = yes

mkdir -p /export/dfsroot`
ln -s msdfs:storage0\\share0 linka`
ln -s msdfs:server1\\share,server2\\share linkb`

Notes

• имена серверов и шар только в нижнем ругистре
• имена ссылок без ограничений

Добавление доверенной зоны на множество КД сразу

dcs="10.64.165.10 10.64.165.11 10.64.165.12"
for i in $dcs; do
    ssh -i ~/.ssh/robot_key root@$i \
    'echo -e "zone \"trust.alt\" {\n        type forward;\n        forward only;\n        forwarders { 10.64.66.46; };\n};\n" >> /etc/bind/named.conf'
done

CPU stress test

pip install s-tui
apt-get install stress
s-tui

Nspawn VM example

[Network]
		Bridge=vms-priv
[Exec]
		## UID/GID mapping delegation for container
		PrivateUsers=no						# for domain ID's outside nspan 65536 range
		## Capabilities
		Capability=CAP_SYS_ADMIN			# just in case, you can try to remove
		#Capability=all						# allow all CAP's at once (not recommended)
		#Capability=help					# list of all avialable CAP's. run systemd-nspawn --capability=help
		## Limit for max file descriptors
		LimitNOFILE=infinity				# samba-common package change ulimit NOFILE to 16384
											# /etc/security/limits.d/90-samba.conf
											# without this option you can't login to container
		## ability to change system call filter
		SystemCallFilter=@keyring			# allows KEYCTL system calls to work with kernel keyring
											# list of all available syscalls: systemd-analyze syscall-filter

Virt-install

LC_ALL=C virt-install --connect qemu:///system --name node-x86_64 --os-type=linux --graphics vnc --ram 4096 --vcpus=12 --network network=default  --virt-type=kvm  --import --autostart --disk /data/libvirt_images/node-x86_64.qcow2 --network network=node-x86_64-v --hvm

ZFS

Разметка диска fdisk (BIOS-MBR + GPT)

g
n -> 1 -> 2048 -> +1M -> y
t -> 1 -> 4
w

Создание zfs pool

zpool create -o ashift=12 -O compression=lz4 -O normalization=formD -O mountpoint=none main /dev/disk/by-uuid/12407395108911578001
zfs create -V 30G main/system