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QUESTION NO: 5
Mount /root/cdrom.iso under /opt/data, and take effect automatically at boot‐start
Answer:
cd /opt/
mkdir data
mount ‐t iso9660 ‐o loop /root/cdrom.iso /opt/data
vim /etc/fstab
/root/cdrom.iso /opt/data iso9660 defaults,loop 0 0
QUESTION NO: 10
Configuring samba server, shared / common, and can browse to the. User harry
shared read‐only, if necessary, harry users password for harryuser were.
Answer:
yum install ‐y postfix
chkconfig smb on
useradd harry
smbpasswd ‐a harry
vim /etc/samba/smb.conf
[common]
comment = common
path = /common
browseable = yes
read only = yes
testarpm
getsebool ‐a |grep samba_share_nfs
setsebool ‐P samba_share_nfs=1
services smb restart
mount ‐t cifs //172.16.30.5/common /mnt ‐o username=harry%harryuser
QUESTION NO: 1
To ensure SELinux open after the boot:
Answer:
vim /etc/sysconfig/selinux
selinux=enforcing
setenforce 1
getenforce
QUESTION NO: 2
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 NO: 11
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 NO: 6
Configure Web server as follow:
Clients within http://station.domain30.example.com should have access to Web
server on your system
Answer:
yum install ‐y httpd
chkconfig httpd on
cd /etc/httpd/conf/
vim httpd.conf
NameVirtualHost 172.24.30.5:80
DocumentRoot /var/www/html/
ServerName tation.domain30.example.com
service httpd restart
QUESTION NO: 9
Configure NFS server to share /common directory with domain30.example.com.
Authenticate the clients devices have the access to it as root user.
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
QUESTION NO: 4
Configure FTP access as follows:
Download from catalog: / var / ftp / pub using anonymous is allowed
Clients within t3gg.com should NOT have access to FTP on your system
Answer:
yum install ‐y vsftpd
chkconfig vsftpd on
services vsftpd start
Deny: uninstall hosts.deny or use iptables
vim /etc/hosts.deny
vsftpd: 172.25.0.0/16
iptables ‐A INPUT ‐s 172.25.0.0/16 ‐p tcp ‐dport 20:21 ‐j REJECT
services iptables save
QUESTION NO: 3
Configure SSH access as follows:
Harry has remote SSH access to your machine from within example.com
Clients within t3gg.com should NOT have access to ssh on your system
Answer:
yum install ‐y sshd
chkconfig sshd on
vim /etc/hosts.deny
sshd: 172.25.0.0/16
Use iptables:
iptables ‐F
iptables ‐X
iptables ‐Z
iptables ‐nvL
iptables ‐A INPUT ‐s 172.25.0.0/16 ‐p tcp ‐dport 22 ‐j REJECT
services iptables save
Each finished writing a iptables rules saved
iptables ‐nvL
cat / etc / services can be used to view port
If wrong, can be modified in vim / etc / sysconfig / iptables
QUESTION NO: 8
Download files from http://ip/dir/restircted.html. Local users have access to it
through http://station.domain30.example.com/restircted, but Clients within
t3gg.com should NOT have access to it.
Answer:
cd /var/www/html
wget http://ip/dir/restircted.htm
iptables ‐A INPUT ‐s 172.25.0.0/16 ‐p tcp ‐dport 80 ‐j REJECT
service iptables save
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