PV, VG, LM exercise lsblk vgcreate lvcreate mkfs.xfs lvs vgs vgextend

By OK -
we can resize root filesystem with LVM running it

 fdsik /dev/sdc

Disk /dev/sdc: 10.7 GB, 10737418240 bytes, 20971520 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0xcbbe4aaa

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1            2048      104447       51200   83  Linux
/dev/sdc2          104448      186367       40960   83  Linux
/dev/sdc3          186368      595967      204800   8e  Linux LVM

Command (m for help): w

partprobe /dev/sdc

=========================
[root@localhost ~]# cat /proc/partitions 
major minor  #blocks  name

   8        0   41943040 sda
...
...
   8       32   10485760 sdc
   8       33      51200 sdc1
   8       34      40960 sdc2
   8       35     204800 sdc3
  11        0    8086528 sr0
 253        0   38789120 dm-0
 253        1    2097152 dm-1
 253        2      94208 dm-2
[root@localhost ~]#

==========================
[root@localhost ~]# lsblk 
...
...
sdc                      8:32   0   10G  0 disk 
├─sdc1                   8:33   0   50M  0 part /sdcmount
├─sdc2                   8:34   0   40M  0 part /lsdc
└─sdc3                   8:35   0  200M  0 part 
sr0                     11:0    1  7.7G  0 rom  /run/media/bit/CentOS 7 x86_64
[root@localhost ~]# 

==========================
[root@localhost ~]# pvcreate /dev/sdc3 
(optional step) 
if you run vgcreate it will automatically create physical volume

WARNING: swap signature detected on /dev/sdc3 at offset 4086. Wipe it? [y/n]: y
  Wiping swap signature on /dev/sdc3.
  Physical volume "/dev/sdc3" successfully created.
[root@localhost ~]#
==========================
[root@localhost ~]# vgcreate vgwhatever /dev/sdc3
  Volume group "vgwhatever" successfully created

[root@localhost ~]# vgs
  VG          #PV #LV #SN Attr   VSize   VFree  
  cl            1   2   0 wz--n-  39.00g   4.00m
  vg_sdbmount   1   1   0 wz--n-  96.00m   4.00m
  vgwhatever    1   0   0 wz--n- 196.00m 196.00m
[root@localhost ~]# 
==========================
[root@localhost ~]# lvcreate -n lvmyvol -L 100M vgwhatever 
  Logical volume "lvmyvol" created.
[root@localhost ~]# 
==========================
[root@localhost ~]# mkfs.xfs /dev/vgwhatever/lvmyvol 
meta-data=/dev/vgwhatever/lvmyvol isize=512    agcount=4, agsize=6400 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=25600, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=855, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
[root@localhost ~]#
==========================
lvs — report information about logical volumes

[root@localhost ~]# lvs
  LV      VG          Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root    cl          -wi-ao----  36.99g                                                 
  swap    cl          -wi-ao----   2.00g                                                 
  lv_sdb  vg_sdbmount -wi-a-----  92.00m                                                 
  lvmyvol vgwhatever  -wi-a----- 100.00m                                                 
[root@localhost ~]# 
==========================
[root@localhost ~]# mkdir /hallo; mount /dev/vgwhatever/lvmyvol /hallo
[root@localhost ~]# mount | grep my
/dev/mapper/vgwhatever-lvmyvol on /hallo type xfs (rw,relatime,seclabel,attr2,inode64,noquota)
[root@localhost ~]# 
===========================
[root@localhost ~]# cd /hallo/
[root@localhost hallo]# dd if=/dev/zero of=bigfile
dd: writing to ‘bigfile’: No space left on device
187329+0 records in
187328+0 records out
95911936 bytes (96 MB) copied, 0.360617 s, 266 MB/s
[root@localhost hallo]# 
==========================
[root@localhost hallo]# df -hk
Filesystem                     1K-blocks    Used Available Use% Mounted on
/dev/mapper/cl-root             38770180 4735892  34034288  13% /
devtmpfs                          488984       0    488984   0% /dev
tmpfs                             499968     156    499812   1% /dev/shm
tmpfs                             499968    7236    492732   2% /run
tmpfs                             499968       0    499968   0% /sys/fs/cgroup

/dev/sr0                         8086368 8086368         0 100% /run/media/bit/CentOS 7 x86_64
/dev/mapper/vgwhatever-lvmyvol     98980   98960        20 100% /hallo
[root@localhost hallo]# 

/dev/mapper/vgwhatever-lvmyvol - mapper word is how the kernel sees
===========================
Logical volumes need space from in volume group
To add space to volume group, we need space in physical group

check free volume group
[root@localhost hallo]# vgs
  VG          #PV #LV #SN Attr   VSize   VFree 
  cl            1   2   0 wz--n-  39.00g  4.00m
  vg_sdbmount   1   1   0 wz--n-  96.00m  4.00m
  vgwhatever    1   1   0 wz--n- 196.00m 96.00m
[root@localhost hallo]# 
===========================
If there is no free space, we have to run
pvcreate and vgextend commands as well
===========================
[root@localhost hallo]# lvextend -L +50M -r /dev/vgwhatever/lvmyvol 
  Rounding size to boundary between physical extents: 52.00 MiB.
  Size of logical volume vgwhatever/lvmyvol changed from 100.00 MiB (25 extents) to 152.00 MiB (38 extents).
  Logical volume vgwhatever/lvmyvol successfully resized.
meta-data=/dev/mapper/vgwhatever-lvmyvol isize=512    agcount=4, agsize=6400 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=25600, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=855, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 25600 to 38912
===============================
[root@localhost hallo]# df -kh
Filesystem                      Size  Used Avail Use% Mounted on
/dev/mapper/vgwhatever-lvmyvol  149M   97M   52M  66% /hallo
[root@localhost hallo]# 




Comments

Post a Comment

Popular posts from this blog

HAproxy logging

By OK -
ubuntu@ubuntu:/etc/haproxy$ cat /etc/rsyslog.d/haproxy.conf # Create an additional socket in haproxy's chroot in order to allow logging via # /dev/log to chroot'ed HAProxy processes $ModLoad imudp $UDPServerRun 514 local0.* -/var/log/haproxy-0.log local1.* -/var/log/haproxy-1.log ### keep logs in localhost ## $AddUnixListenSocket /var/lib/haproxy/dev/log ------------------- ubuntu@ubuntu:/etc/haproxy$ cat /etc/haproxy/haproxy.cfg global chroot /var/lib/haproxy user haproxy group haproxy log 127.0.0.1   local0         log 127.0.0.1   local1 notice daemon frontend www     bind 192.168.40.128:8282    # haproxy public IP     default_backend as-backend    # backend used backend as-backend    balance leastconn    mode http  server as1 192.168.40.128:8082 check    # application srv 1 defaults log ...
Read more

teamcity Automatic Agent Start under Linux

By OK -
Automatic Agent Start under Linux To run agent automatically on the machine boot under Linux, configure daemon process with the  agent.sh start  command to start it and  agent.sh stop  command to stop it. Refer to an example procedure below: 1. Navigate to the services start/stop services scripts directory: cd /etc/init.d/ 2. Open the build agent service script: sudo vim buildAgent 3. Paste the following into the file : #!/bin/sh ### BEGIN INIT INFO # Provides: TeamCity Build Agent # Required-Start: $remote_fs $syslog # Required-Stop: $remote_fs $syslog # Default-Start: 2 3 4 5 # Default-Stop: 0 1 6 # Short-Description: Start build agent daemon at boot time # Description: Enable service provided by daemon. ### END INIT INFO #Provide the correct user name: USER="agentuser" case "$1" in start) su - $USER -c "cd BuildAgent/bin ; ./agent.sh start" ;; stop) su - $USER -c "cd BuildAgent/bin ; ./agent....
Read more

NFS mount add in fstab _netdev instead of default | firewall-cmd --list-all

By OK -
Redhat recommends us to add  _netdev  option for NFS file system in /etc/fstab. So that they can be mounted after starting the networking service. Alternative ways to refer to partitions: Label : LABEL=label Network ID Samba : //server/share NFS : server:/share SSHFS : sshfs#user@server:/share Device : /dev/sdxy (not recommended) Example #1 //192.168.1.134/share_name /mnt/share_name cifs username=server_user,password=server_password,_netdev 0 0 ^ Path to your share ^ Mountpoint ^ Username ^ Password ^ See note A Note A: The  _netdev  options makes sure the mount is only attempted AFTER a network connection has been established. Example #2 10.10.10.1:/vol1/fs1 /data nfs defaults,_netdev 0 0 ============================ [root@localhost ~]# firewall-cmd --list-all public   target: default   icmp-block-inversion: no   interfaces:   sources:   services: dhcpv6-client high-availabi...
Read more