parted show empty space

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parted /dev/sda ‘print free’

ipmi reset root/admin password

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ipmitool user list 1
ipmitool user set password 2
Password for user 2:
Password for user 2:

To setup new user:
ipmitool user set name 3 admin
ipmitool user set password 3

Enable access:
ipmitool channel setaccess 1 3 link=on ipmi=on callin=on privilege=4

ipmi restart

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ipmitool mc reset cold

nginx request time latency

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log_format time '$remote_addr - $remote_user [$time_local] ' '"$request" $status $body_bytes_sent ' '"$http_referer" "$http_user_agent" ' '$request_time $upstream_response_time $pipe';

access_log /var/log/nginx/access.log time;

dumps tasks that are in uninterruptable (blocked) state

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echo w >/proc/sysrq-trigger

dmesg
[4680785.899872] Show Blocked State
[4680785.900063] task taskaddr stack pid father veid
[4680785.900223] lxc-start D ffff8802eed94640 0 74111 68892 113 0x00000084
[4680785.900228] ffff88008d5b3c18 0000000000000086 0000000000000000 ffff8804212a74c8
[4680785.900233] ffff88008d5b3b98 ffffffff811e374c 00109c9dbec7d9ab ffff8804212a7400
[4680785.900237] ffff8804212a74c8 0000000000000000 0000000216c01c50 00000000000004b4
[4680785.900241] Call Trace:
[4680785.900248] [] ? dispose_list+0xfc/0x120
[4680785.900253] [] fsnotify_unmount+0x1d5/0x270
[4680785.900258] [] ? autoremove_wake_function+0x0/0x40
[4680785.900262] [] fsnotify_unmount_mnt+0x29/0x40
[4680785.900267] [] mntput_no_expire+0xf3/0x110
[4680785.900270] [] release_mounts+0xa9/0xc0
[4680785.900274] [] put_mnt_ns+0x98/0xc0
[4680785.900278] [] ? proc_delete_inode+0x0/0xa0
[4680785.900281] [] mntns_put+0xe/0x10
[4680785.900284] [] proc_delete_inode+0x8e/0xa0
[4680785.900288] [] generic_delete_inode+0xd8/0x1d0
[4680785.900291] [] iput+0xc9/0x110
[4680785.900294] [] dentry_iput+0xa0/0x110
[4680785.900298] [] d_kill+0x3c/0x70
[4680785.900301] [] dput_nocache+0xf6/0x260
[4680785.900304] [] dput+0x10/0x20
[4680785.900308] [] __fput+0x1d7/0x290
[4680785.900312] [] fput+0x25/0x30
[4680785.900315] [] filp_close+0x60/0x90
[4680785.900319] [] sys_close+0xa5/0x100
[4680785.900324] [] system_call_fastpath+0x2f/0x34

openvz find process by container id

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ps ax | awk '{print $1}' | xargs vzpid | grep CTID

lxc-start: lxc_start.c: main: 290 Executing ‘/sbin/init’ with no configuration file may crash the host

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lxc-start -n centos -F
Make sure server name is correct, you are trying to start

openvz vzctl enter save bash history

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This also helps detect login/access on your OpenVZ from node echo "HISTFILE=~/.bash_history" >> /root/.bashrc

glusterfs inside openvz

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Enable Fuse: modprobe fuse vzctl set CID --devices c:10:229:rw --save vzctl exec CID mknod /dev/fuse c 10 229 vzctl set CID --capability sys_admin:on --save


Server 1:

yum update

yum install epel-release

yum install centos-release-gluster41

yum -y install glusterfs-server
systemctl enable glusterd.service

systemctl start glusterd.service

systemctl status glusterd.service
* glusterd.service - GlusterFS, a clustered file-system server

   Loaded: loaded (/usr/lib/systemd/system/glusterd.service; enabled; vendor preset: disabled)

   Active: active (running) since Sat 2018-09-01 20:15:28 UTC; 9h ago

 Main PID: 1854 (glusterd)

   CGroup: /system.slice/glusterd.service

           |-1854 /usr/sbin/glusterd -p /var/run/glusterd.pid --log-level INFO

           |-1986 /usr/sbin/glusterfsd -s data1 --volfile-id datavol.data1.data -p /var/run/gluster/vols/datavol/data1-data.pid -S /var/run/gluster/52b652b9976d3fea.soc...

           |-2008 /usr/sbin/glusterfsd -s data2 --volfile-id datavol.vit2.data -p /var/run/gluster/vols/datavol/data2-data.pid -S /var/run/gluster/8d0878ede60c3f54.soc...

           `-2031 /usr/sbin/glusterfs -s localhost --volfile-id gluster/glustershd -p /var/run/gluster/glustershd/glustershd.pid -l /var/log/glusterfs/glustershd.log..
glusterfsd -V

glusterfs 4.1.3
Server 1:

gluster peer probe data2

Server 2:

gluster peer probe data1
gluster peer status

Number of Peers: 1

Hostname: xx.xx.xx.xx

Uuid: xxxxxxx-xxxx-xxxx-xxxxx-xxxxxxxxxx

State: Peer in Cluster (Connected)
gluster volume create datavol replica 2 transport tcp data1:/data data2:/data force

volume create: datavol: success: please start the volume to access data
gluster volume start datavol
Because its TCP replica, you can check:

netstat -tap | grep glusterfsd

tcp        0      0 0.0.0.0:49152           0.0.0.0:*               LISTEN      1986/glusterfsd

tcp        0      0 0.0.0.0:49153           0.0.0.0:*               LISTEN      2008/glusterfsd 
or
Some protection:

gluster volume set datavol auth.allow xx.xx.xx.* # 192.168.100.*
gluster volume info
Volume Name: testvol

Type: Replicate

Volume ID: xxxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx

Status: Started

Snapshot Count: 0

Number of Bricks: 1 x 2 = 2

Transport-type: tcp

Bricks:

Brick1: data1:/data

Brick2: data2:/data

Options Reconfigured:

auth.allow: xx.xx.xx.*

transport.address-family: inet

nfs.disable: on

performance.client-io-threads: off
Mount data on server or client:

yum -y install glusterfs-client

mkdir /var/data

mount.glusterfs data1:/datavol /var/data
Save on boot:

vi /etc/rc.local

mount.glusterfs data1:/datavol /var/data

Mount failed. Please check the log file for more details glusterfs

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tail -50 /var/log/glusterfs/mnt-data-volume.log

Fix was:
lsmod | grep fuse
modprobe fuse

Error: Package: kmod-kvdo vdo ( Requires: kernel dm_put_device)

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Error: Package: kmod-kvdo-6.1.0.181-17.el7_5.x86_64 (updates) Requires: kernel(dm_unregister_target) = 0x35ba4186 Installed: kernel-3.10.0-862.el7.x86_64 (@anaconda) kernel(dm_unregister_target) = 0x62b8c739 Installed: vzkernel-3.10.0-862.9.1.vz7.63.3.x86_64 (@openvz-os) kernel(dm_unregister_target) = 0x97f3d3e0 Available: kernel-debug-3.10.0-862.el7.x86_64 (base) kernel(dm_unregister_target) = 0x9fea9142 Available: kernel-debug-3.10.0-862.2.3.el7.x86_64 (updates) kernel(dm_unregister_target) = 0x9fea9142 Available: kernel-debug-3.10.0-862.3.2.el7.x86_64 (updates) kernel(dm_unregister_target) = 0x9fea9142 Available: kernel-debug-3.10.0-862.3.3.el7.x86_64 (updates) kernel(dm_unregister_target) = 0x9fea9142 Available: kernel-debug-3.10.0-862.6.3.el7.x86_64 (updates) kernel(dm_unregister_target) = 0xe573fa0d Available: kernel-debug-3.10.0-862.9.1.el7.x86_64 (updates) kernel(dm_unregister_target) = 0xe573fa0d Available: kernel-debug-3.10.0-862.11.6.el7.x86_64 (updates) kernel(dm_unregister_target) = 0xe573fa0d Available: vzkernel-debug-3.10.0-862.9.1.vz7.63.3.x86_64 (openvz-os) kernel(dm_unregister_target) = 0x854b76de You could try using --skip-broken to work around the problem You could try running: rpm -Va --nofiles --nodigest


Fix:

yum --disablerepo=* --enablerepo=base install vdo kmod-kvdo

centos 7 openvz

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yum install epel*release
yum install prlctl prl-disp-service vzkernel
reboot
systemctl status vz

Kickstart install Centos 7 using virt-install

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sudo qemu-img create -f qcow2 /var/lib/libvirt/images/centos7.qcow2 15G


sudo iptables -t nat -A POSTROUTING -j MASQUERADE

or

firewall-cmd --zone=external --add-masquerade --permanent

firewall-cmd --reload
This helps avoid errors like: dracut-initqueue[688]: Warning: unknown network kickstart URL: ...
mkdir kick && mkdir kick
vim centos7.cfg
#version=RHEL7

install
auth --enableshadow --passalgo=sha512

repo --name="EPEL" --baseurl=http://dl.fedoraproject.org/pub/epel/7/x86_64

eula --agreed

reboot

url --url="http://mirror.litnet.lt/centos/7/os/x86_64/"

firstboot --enable

ignoredisk --only-use=vda

keyboard --vckeymap=en --xlayouts='en'

lang en_US.UTF-8
network  --bootproto=dhcp --device=enp0s3 --noipv6 --activate

network  --hostname=centos7.test.local

rootpw mypassword

services --enabled=NetworkManager,sshd,chronyd

timezone Europe/Vilnius --isUtc --ntpservers=0.centos.pool.ntp.org,1.centos.pool.ntp.org,2.centos.pool.ntp.org,3.centos.pool.ntp.org

user --groups=wheel --homedir=/home/monit --name=monit --password=password --iscrypted --gecos="monit"

bootloader --location=mbr --boot-drive=vda

autopart --type=lvm

zerombr

clearpart --all --drives=vda

selinux --permissive
%packages

@base

@core

chrony

yum-cron

%end
python -m SimpleHTTPServer 1111

Serving HTTP on 0.0.0.0 port 1111 ...

or

python3 -m http.server 1111

Serving HTTP on 0.0.0.0 port 1111 (http://0.0.0.0:1111/) ...
sudo virt-install --connect=qemu:///system --network=bridge:virbr0 --extra-args="ks=http://192.168.0.101:1111/centos7.cfg console=tty0 console=ttyS0,115200" --name=centos7 --disk /var/lib/libvirt/images/centos7.qcow2,size=15,device=disk,bus=virtio,format=qcow2 --ram 1500 --vcpus=1 --check-cpu --accelerate --hvm --location=http://mirror.litnet.lt/centos/7/os/x86_64/ --nographics
CentOS Linux 7 (Core)

Kernel 3.10.0-862.el7.x86_64 on an x86_64
centos7 login:

union file systems overlay

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mkdir -v lowerdir upperdir workdir overlay sudo tree . ├── lowerdir ├── overlay ├── upperdir └── workdir


lowerdir layer (read only, base layer)

overlay layer (main view)

work layer  (diff view, diff layer )
sudo mount -t overlay -o lowerdir=lowerdir,upperdir=upperdir,workdir=workdir overlay overlay
echo test > lowerdir/test
sudo tree

.

├── lowerdir

│   └── test

├── overlay

│   └── test

├── upperdir

└── workdir

    └── work

echo 'some new data' >> overlay/test sudo tree . ├── lowerdir │ └── test ├── overlay │ └── test ├── upperdir │ └── test └── workdir └── work

This is principe how docker is working.

ERROR Host does not support any virtualization options

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sudo dnf install qemu-kvm

Server 24/7

I am Vitalijus Ryzakovas. This is my LINUX/UNIX blog.

parted show empty space

ipmi reset root/admin password

ipmi restart

nginx request time latency

dumps tasks that are in uninterruptable (blocked) state

openvz find process by container id

lxc-start: lxc_start.c: main: 290 Executing ‘/sbin/init’ with no configuration file may crash the host

openvz vzctl enter save bash history

glusterfs inside openvz

Mount failed. Please check the log file for more details glusterfs

Error: Package: kmod-kvdo vdo ( Requires: kernel dm_put_device)

centos 7 openvz

Kickstart install Centos 7 using virt-install

union file systems overlay

ERROR Host does not support any virtualization options