第２世代目のRedHat Linux時代の情報です。
FTPサービスを実現するソフトウェアにProFTPDがあります．RPMでインストールすると設定ファイルは/etc/proftpd.confです．この設定を見ていきます．
# This is the ProFTPD configuration file
# 起動時に最初に表示させるメッセージ
ServerIdent on "tamochan.com FTP Server ready."
#アドミニストレータのメールアドレス
ServerAdmin root@tamochan.com
#ined経由で起動するので，standaloneではなくて，inetd
ServerType inetd
DefaultServer on
# Use pam to authenticate by default
AuthPAMAuthoritative on
# Do not perform ident lookups (hangs when the port is filtered)
IdentLookups off
# Port 21 is the standard FTP port.
Port 21
# Umask 022 is a good standard umask to prevent new dirs and files
# from being group and world writable.
Umask 022
# Chmod isn't allowed by default
#AllowChmod on
# Default to show dot files in directory listings
LsDefaultOptions "-a"
# See Configuration.html for these (here are the default values)
#MultilineRFC2228 off
#RootLogin off
#LoginPasswordPrompt on
#MaxLoginAttempts 3
#MaxClientsPerHost none
# To prevent DoS attacks, set the maximum number of child processes
# to 30. If you need to allow more than 30 concurrent connections
# at once, simply increase this value. Note that this ONLY works
# in standalone mode, in inetd mode you should use an inetd server
# that allows you to limit maximum number of processes per service
# (such as xinetd)
MaxInstances 30
# Set the user and group that the server normally runs at.
User nobody
Group nobody
# Normally, we want files to be overwriteable.
<Directory /*>
AllowOverwrite on
</Directory>
#anonumous(匿名)は受け付けないようにするため，コメントアウト．
# A basic anonymous configuration, no upload directories.
#<Anonymous ~ftp>
# Uncomment the following line to allow anonymous access
#RequireValidShell off
# AllowChmod off
# User ftp
# Group ftp
# AccessGrantMsg "Anonymous login ok, restrictions apply."
# We want clients to be able to login with "anonymous" as well as "ftp"
# UserAlias anonymous ftp
#
# Limit the maximum number of anonymous logins
# User ftp
# Group ftp
# AccessGrantMsg "Anonymous login ok, restrictions apply."
# We want clients to be able to login with "anonymous" as well as "ftp"
# UserAlias anonymous ftp
#
# Limit the maximum number of anonymous logins
# MaxClients 10
# We want 'welcome.msg' displayed at login, '.message' displayed in
# each newly chdired directory and tell users to read README* files.
# DisplayLogin welcome.msg
# DisplayFirstChdir .message
# DisplayReadme README*
# Limit WRITE everywhere in the anonymous chroot
# <Limit WRITE>
# DenyAll
# </Limit>
#</Anonymous>
FTPはinetdを経由して起動します．inetdとは，一つのプロセスでいろんなポートを見張っていて、クライアントからの通信が来た場合に初
めてサーバを実行してくれる便利な仕組みのことです．そこで次に，このinetdの設定をします．RedHatでは，inetdのさらに強力な管理機能を
持つxinetdになっています．設定ファイルは/etc/xinetd.d/proftpdです．
# default: off
# description: The ProFTPD FTP server serves FTP connections. It uses \
# normal, unencrypted usernames and passwords for authentication.
service ftp
{
socket_type = stream
wait = no
user = root
server = /usr/sbin/in.proftpd
log_on_success += DURATION USERID
log_on_failure += USERID
nice = 10
disable = no
}
曲者はdisableでしょうか．デフォルトではyesになっていますが，noにしないと，起動しません．