EX200 Leak Questions

1. chmod g+s /data

2. Verify using: ls -ld /data

Permission should be like this: drwxrws--- 2 root sysadmin 4096 Mar 16 18:08 /data

If SGID bit is set on directory then who every users creates the files on directory group owner automatically the owner of parent directory. To set the SGID bit: chmod g+s directory To Remove the SGID bit: chmod g-s directory

*

[root@node2 ~]# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

vdb 252:16 0 5G 0 disk

└─vdb1 252:17 0 4.2G 0 part

└─vgrz-lvrz 253:2 0 4.1G 0 lvm /datarz

vdc 252:32 0 5G 0 disk

vdd 252:48 0 5G 0 disk

vde 252:64 0 10G 0 disk

[root@node2 ~]# parted /dev/vdc mklabel msdos

[root@node2 ~]# parted /dev/vdc mkpart primary 1MiB 4200MiB

[root@node2 ~]# parted /dev/vdc set 1 lvm on

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[root@node2 ~]# udevadm settle

[root@node2 ~]# pvcreate /dev/vdc1

Physical volume "/dev/vdc1" successfully created.

[root@node2 ~]# vgcreate -s 16M datavg /dev/vdc1

Volume group "datavg" successfully created

[root@node2 ~]# lvcreate -n datalv -L 4000M datavg

Logical volume "datalv" created.

[root@node2 ~]# mkfs.xfs /dev/datavg/datalv

[root@node2 ~]# mkdir /data

[root@node2 ~]# blkid

/dev/mapper/datavg-datalv: UUID="7397a292-d67d-4632-941e-382e2bd922ce" BLOCK_SIZE="512" TYPE="xfs"

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[root@node2 ~]# vim /etc/fstab

UUID=7397a292-d67d-4632-941e-382e2bd922ce /data xfs defaults 0 0

[root@node2 ~]# mount UUID=7397a292-d67d-4632-941e-382e2bd922ce /data

[root@node2 ~]# reboot

[root@node2 ~]# df -hT

Filesystem Type Size Used Avail Use% Mounted on

/dev/mapper/datavg-datalv xfs 3.9G 61M 3.9G 2% /data

# fdisk /dev/sda

p

(check Partition table)

n

(create new partition: press e to create extended partition, press p to create the main partition, and the extended partition is further divided into logical partitions)

Enter

+2G t

8 I

82

W

partx -a /dev/sda

partprobe

mkswap /dev/sda8

Copy UUID

swapon -a

vim /etc/fstab

UUID=XXXXX swap swap defaults 0 0

(swapon -s)

# useradd -u 601 -s /sbin/nologin user1

# passwd user1

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