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Vendor: RedHat
Certifications: RHCE certification
Exam Name: Red Hat Certified Engineer (RHCE)
Exam Code: EX300
Total Questions: 36 Q&As
QUESTION 1
Write a script / root / program, the requirements when the input parameter kernel to the script, the script returns the user, the input parameters to the script user, the script returns the kernel. While the script no parameters or parameter error, the output from the standard error output usage: / root / the program kernel | user
Answer:
vim /root/program
#!/bin/bash
if [ “$1” == “kernel”];then
echo “user”
elif [“$1” == “user”];then
echo “kernel”
else
echo “usage:/root/program kernel|user”
fi
Test:
chmod a+x /root/program
.root/program kernel
./root/program user
./root/program lll
QUESTION 2
Please visit iscsi shared storage, storage server address is 172.24.30.100, ceded 1500M space, formatted with the ext3 file system, mount / mnt / data, and boot automatically mount.
Answer:
yum install ‐y iscsi*
chkconfig iscsid on
chkconfig iscsi on
iscsiadm ‐m discovery ‐t st ‐p 172.24.30.100:3260
iscsiadm ‐m node ‐T iqn.2011 ‐p 172.24.30.100 ‐|
service iscsi restart
fdisk ‐|
fdisk /dev/sda
partx ‐a /dev/sda
partx ‐a /dev/sda
mkfs.ext3 /dev/sad1
yum ‐y install tree
cd /var/lib/iscsi
tree . view iqn
cd /mnt
mkdir data
blkid /dev/sda1 (View UUID, UUID mount)
vim /etc/fstab
UUID=XXX /mnt/data ext3 default, _netdev 0 0
mount ‐a
QUESTION 3
Configuring the NFS service that will /mnt /storage directory with read‐only shared to the example.com domain user when the client as the root user will also have access to the root directory permissions to read‐only shared to cracker.org domain users. EX300 dumps
Answer:
# vim /etc/exports
/mnt/storage *.example.com(ro,sync,no_root_squash)
/mnt/storage *.cracker.org(ro,sync)
QUESTION 18
Example.com only allows access to the local SSH.
Answer:
# vim /etc/hosts.allow
sshd: .example.com
# vim /etc/hosts.deny
sshd: ALL
QUESTION 4
Configure cron as follow:
Clients tom should NOT have access to cron
Answer:
useradd tom
vim /etc/cron.deny
tom
Effective immediately save and exit.
QUESTION 5
Configure Kernel parameters rhelblq=1 and enable /proc/cmdline to verify your Kernel parameters.
Answer:
Vim /etc/grub.conf
Write the end of the kernel line
To see after restart
cat /proc/cmdline
QUESTION 6
Configure an email server domian30.example.com, and it requests to send and receive emails from the local server or the user harry can send or receive emails from network. The email of user harry is /var/spool/mail/harry.
Please note: the DNS server has already been MX record.
Answer:
yum install ‐y postfix
chkconfig postfix on
vim /etc/postfix/main.cf
inet_interfaces = all
mydestination = example.com, domain30.example.com, localhost
mynetworks = 172.16.30.0/24, 127.0.0.1/8
services postfix restart
Test:
netstat ‐tulnp |grep 25
hostname
echo hello |mail ‐s “test”[email protected]
cat /var/spool/mai/harry
QUESTION 7
Connect to mail server and send email to admin, ensure that user harry can revive it.
Answer:
vim /etc/aliases
admin: harry
newaliases
QUESTION 8
Samba configuration requirements are as follows:
1. The Working Group called RHCE
2. Types of user authentication
3. Shared / mnt / storage directory share name for the share
4. The shared directory allows user1 and user2 user has write permissions to other users are read‐only, if you need password are redhat
5. only allows the user to access the shared directory domain example.com
Answer:
# yum install ‐y samba
# vim /etc/samba/smb.conf
[global]
workgroup = RHCE
security = user
[share]
path = /mnt/storage
write list = user1 user2
hosts allow = .example.com
# ( echo redhat ; echo redhat ) | smbpasswd ‐s ‐a user1
# ( echo redhat ; echo redhat ) | smbpasswd ‐s ‐a user2
# service smb start; chkconfig smb on
QUESTION 9
Establish vsftp server, so that only allow user1 user access, and cannot jump out of home directories only allow users to upload and download example domain, allowing only example domains can be accessed. EX300 dumps
Answer:
# yum ‐y install vsftpd
# vim /etc/vsftpd/vsftpd.conf
userlist_deny=NO
userlist_file=/etc/vsftpd/vsftpd.user_list
chroot_list_enable=YES
chroot_list_file= /etc/vsftpd/vsftpd.chroot_list
anon_upload_enable=YES
anonymous_enable=YES
# mkdir ‐p /var/ftp/incoming; chmod 777 /var/ftp/incoming
# chcon ‐t public_content_rw_t /var/ftp/incoming
# setsebool ‐P allow_ftpd_anon_write 1
# setsebool ‐P ftp_home_dir 1
# vim /etc/vsftpd/vsftpd.user_list
user1
# vim /etc/vsftpd/vsftpd.chroot_list
user1
# service vsftpd start; chkconfig vsftpd on
# vim /etc/hosts.deny
vsftpd: ALL EXCEPT .example.com
QUESTION 10
Create new mail server, the following:
1. Allow localhost and remote hosts can access
2. Allow example.com users can relay to refuse remote test
3. All mail sent to the user3 will be sent to user2
4. Confirm / var/spool/mail/user1 exist
5. Example.com domain only allows the user to receive mail via pop3
Answer:
# yum install postfix ‐y
# alternatives ‐‐set mta (Choose postfix)
# service sendmail stop; chkconfig sendmail off
# cd /etc/postfix
# vim main.cf
myhostname = stationX.example.com
mynetworks_style = subnet
mydestination = $ myhostname
myorigin = $ myhostname
relay_domains = example.com, $mydestination
inet_interfaces = all
smtpd_client_restrictions =
check_client_access hash:/etc/postfix/access,
check_sender_access hash:/etc/postfix/access,
check_recipient_access hash:/etc/postfix/access,
permit_auth_destination,
permit_mynetworks,
# vim /etc/postfix/access
remote.test REJECT
# vim /etc/aliases
user3: user2
# postalias /etc/aliases
# postmap hash:/etc/postfix/access
# touch /var/spool/mail/user1 (Generally exist by default)
# chown user1:mail /var/spool/mail/user1
# chcon ‐‐reference=/var/spool/mail/root /var/spool/mail/user1
# chmod 660 /var/spool/mail/user1
# Reject remote.test domains can use iptables.
# iptables ‐A INPUT ‐p tcp ‐‐dport 25 ‐s remote.test(Written IP network segment) ‐j
REJECT
# service postfix start; chkconfig postfix on
# yum install dovecot
# vim /etc/dovecot.conf
protocols = pop3
# service dovecot start; chkconfig dovecot on
# iptables ‐A INPUT ‐p tcp ‐‐dport 110 ‐s 192.168.0.0/24 ‐j
ACCEPT
# iptables ‐A INPUT ‐p tcp ‐‐dport 110 ‐j REJECT
# service iptables save; chkconfig iptables on
QUESTION 11
Open system kernel forwarding packets function:
Answer:
vim /etc/sysctl.conf
net.ipv4.ip_forward = 1
sysctl ‐w (Effective immediately)
The following commands should executed without sysctl.conf option:
sysctl ‐a |grep net.ipv4
sysctl ‐P net.ipv4.ip_forward = 1
sysctl ‐w
QUESTION 12
Configure NFS server to share /common directory with domain30.example.com.
Authenticate the clients devices have the access to it as root user. EX300 dumps
Answer:
yum install ‐y nfs
chkconfig nfs on
chkconfig rpcbind on
vim /etc/exports
/common 172.24.30.0/255.255.255.0 (rw,no_root_squash)
showmount ‐e 172.16.30.5
mount ‐t nfs 172.16.30.5:/common /mnt
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