Which is weird to me because isn’t that the updates are suppose to fix the vulnerabilities?

To overcome the error building/upgrade the port, invoke the make argument by allowing the portupgrade

# portupgrade -vr -m DISABLE_VULNERABILITIES=yes php52*

This will ignore the vulnerabilities error message and continue with portupgrade of php52 packages. It can be use for other ports upgrade when you see the vulnerability error messages.

I usually refer to the timezone conversion table at Eastern Time to GMT

For example let say the online seminar is happening at EDT 21:00, it will be 01:00, +8 which is 09:00 (the next day) in my country.

It is always better to have MySQL Data Directory store in a specific partition/drive. It will help on performance and better management and scalability. You change change the data store directory in Linux by editing /etc/my.cnf file.

Edit /etc/my.cnf file

# vi /etc/my.cnf

Change the data directory structure

datadir=/db/mysql
socket=/db/mysql/mysql.sock

After the file has been updated, restart MySQL service.

$ wget -q -O - http://ipchicken.com |  grep -o -E '(^|[[:space:]])[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*([[:space:]]|$)'
# By default, FreeBSD doesn't have wget, you can use fetch instead
$ fetch -q -o - http://www.ipchicken.com | grep -o -E '(^|[[:space:]])[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*([[:space:]]|$)'

You need port 80 external/WAN access to perform the task.

check_dns usage is as below

$ ./check_dns -H host [-s server] [-a expected-address] [-A] [-t timeout] [-w warn] [-c crit]

Try to run the command as below and you will get the query result

$ ./check_dns -H systems.takizo.com -s 8.8.8.8
DNS OK: 0.012 seconds response time. systems.takizo.com returns 70.32.103.130|time=0.011703s;;;0.000000

Sweet, that is the DNS query plugin, it does DNS query check on your DNS host server and return the query time.
Here is how to activate the monitoring, add the check_dns plug-in into Nagios’ commands.cfg configuration file.

On FreeBSD server, it’s located at /usr/local/etc/nagios/objects/commands.cfg
Edit the file commands.cfg and add the line below

define command {
        command_name    check_dns
        command_line       $USER1$/check_dns -H $ARG1$ -s $HOSTADDRESS$
}

• $ARG1$ is the argument you will parse into in the configuration
• $HOSTADDRESS$ is your host on Nagios monitoring.

Next, put the line below into service check configuration file

define service {
        use                                  generic-service
        host_name                       your-dns-host
        service_description          Check Google.com on DNS Server
        check_command              check_dns!www.google.com
}

Restart your Nagios service now

$ /usr/local/etc/rc.d/nagios restart

If it’s failed, you will the red color on the monitoring status. There are a lot other plug-ins can be explore too. Have fun.

• Bind DLZ – The Bind extension which can store your data in database MySQL, PostgreSQL and etc.
• NSD – A lot people didn’t know about Name Server Daemon, find out more from the eBook.
• DNS Planning – Name Server deployment planning, capacity planning and how to scale.
• PowerDNS – Configure and master it.
• LDAP DNS – Deploy DNS server with LDAP.

Alright, enough with the talks, where to download the eBook? It’s FREE for Download here

So which DNS server do you resolve it from? For example we run a query on DNS F Root Server

$ dig @f.root-servers.net hostname.bind  txt ch +short
"lga1a.f.root-servers.org"

On the result, it shows that I am using lga1a.f.root-servers.org as resolver. Some DNS server does reply “chaos” (ch) request but some refuse; for example Google DNS and Open DNS Server. So if your ISP is running Anycast DNS, you can try to lookup where is the DNS server locate.

There is another command perform checking via “id.server” query, it only helpful when the DNS has server-id configured.

dig @k.root-servers.net id.server txt ch +short
"k2.tokyo.k.ripe.net"

To enable Chinese character in iTerm, change the encoding to UTF-8

Open your iTerm Terminal
Press Apple Command key + i
Encoding, select UTF-8
Remember to click on Update Default

In Exim mail MTA, it can restricts at the SMTP authenticated transport.

accept  authenticated = *
          sender_domains = < the_domain_name_1 > : < the_domain_name_2 >
          control       = submission
          control       = dkim_disable_verify

Usually local_domains is the list of the domain hosted on Exim mail server, it can be configured as below too.

accept  authenticated = *
          sender_domains = +local_domains
          control       = submission
          control       = dkim_disable_verify

echo "username\t password\n"

In order to print tab and newline, invoke -e in the echo command

ehco -e "username\t\t password\n"