User:Tom/RHCE EX300-2

25 Configuring Kerberos

KDC     Key Distribution Center. A central key server. Issues tickets.
Realm   All hosts taht use the same KDC to get tickets.
TGT     Ticket Granting Ticket

Principal name nfs/server.example.com@EXAMPLE.COM
User name      tom@EXAMPLE.COM

Commands

authconfig       Configure LDAP authentication with Kerberos authorization.
authconfig --test         Get an overview of the current configuration and see what services are used.
authconfig-tui
authconfig-gtk

klist                      Lists cached Kerberos tickets.
      

Files

/etc/krb5.keytab           Needed by a server hosting Kerberized services. Contains names of all service principals on that server.

/etc/nslcd.conf
/etc/nsswitch.conf 
/etc/openldap/cacerts
/etc/openldap/ldap.conf
/etc/pamd.d/
/etc/sssd/sssd.conf        Install sssd service before using the authcong utilities (yum install group "Directory Client"
/etc/sysconfig/authconfig

...

34 DNS

Unbound is the preferred package.

Install, enable and start unbound.

/etc/unbound/unbound.conf

35 MariaDB

install mariadb mariadb-server mariadb test
systemctl start mariadb
systemctl enable mariadb

Italic text

firewall-cmd --add-service mysql --permanent

mysql_secure_installation
/usr/libexec/mysqld --help --verbose          Information about all the settings

show databases;
use databases;
create database dbname;
create tsble tablename (name varchar(40),place varchar(40));
describe tablename;

delete from tablename where field = ' value ';
update tablename set field = value where field2 = ' value ';
insert into tablename (field1,field2) values(' value1 ',' value2 ');

where clause = <> > >= <  >= BETWEEN LIKE IN

create user username@'localhost' identified by password;
drop user 'username'@'localhost';
grant select,update,delete,insert on *.* to username@'localhost';  
grant all priviliges on ...

mysqldump -u root =p -p database --databases >dumpfileItalic text
drop database databasename;
create database databasename;
mysql -u root -p -p databasename <dumpfile;

37 Samba

man mount.cifs credentials= option

39 Configure SSH

semanage port, man sshd_config, ssh-agent, ssh-add, ssh tunnel.

40 Time synchronisation

Chronyd daemon, chronyc command. ntp port 123. start, enable, firewall-cmd --add-service

List commands
getsebool -a                      List all selinux booleans
seinfo                            SELinux policy query tool
         --all
         -r                       List all roles
         -t                       List all types (*-t)
         -u                       List all users
semanage boolean --list           List SELinux booleans with comments
semanage fcontext -l              List all current rules