Red Hat NETSCAPE MANAGEMENT SYSTEM 6.2 - COMMAND-LINE Guida di Installazione Scaricare il pdf (Pagina 57)

958 ? S 0:46 \_ named −u named

959 ? S 0:47 \_ named −u named

960 ? S 0:00 \_ named −u named

961 ? S 0:11 \_ named −u named

1051 ? S 0:30 /usr/libexec/postfix/master

1703 ? S 0:00 \_ tlsmgr −l −t fifo −u −c

1704 ? S 0:00 \_ qmgr −l −t fifo −u −c

1955 ? S 0:00 \_ pickup −l −t fifo −c

1863 ? S 0:00 \_ trivial−rewrite −n rewrite −t unix −u −c

2043 ? S 0:00 \_ cleanup −t unix −u −c

2049 ? S 0:00 \_ local −t unix

2062 ? S 0:00 \_ smtpd −n smtp −t inet −u −c

A couple of things to note here. We have two by now familiar daemons here: named and postfix (smtpd).

Both are spawning sub−processes. In the case of named, what we are seeing is threads, various

sub−processes that it always spawns. Postfix is also spawning sub−processes, but not as "threads". Each

sub−process has its own specific task. It is worth noting that child processes are dependent on the parent

process. So killing the parent PID, will in turn kill all child processes.

If all this has not shed any light, we might also try locate:

$ locate /master

/etc/postfix/master.cf

/var/spool/postfix/pid/master.pid

/usr/libexec/postfix/master

/usr/share/vim/syntax/master.vim

/usr/share/vim/vim60z/syntax/master.vim

/usr/share/doc/postfix−20010202/html/master.8.html

/usr/share/doc/postfix−20010202/master.cf

/usr/share/man/man8/master.8.gz

find is perhaps the most flexible file finding utility, but doesn't use a database the way locate does, so is

much slower:

$ find / −name master

/usr/libexec/postfix/master

If lsof is installed, it is another command that is useful for finding who owns processes or ports:

# lsof −i :631

COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME

cupsd 1315 root 0u IPv4 3734 TCP *:631 (LISTEN)

This is again telling us that the cupsd print daemon is the owner of port 631. Just a different way of getting at

it. Yet one more way to get at this is with fuser, which should be installed:

# fuser −v −n tcp 631

Security Quick−Start HOWTO for Red Hat Linux

8.3.2. Port and Process Owners 54

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 81 82

Nessun commento

Red Hat NETSCAPE MANAGEMENT SYSTEM 6.2 - COMMAND-LINE Guida di Installazione Pagina 57