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Minimal ISO: GRUB UEFI has incorrect config
by Adam Bishop 03 Apr '13

03 Apr '13

Hello, I've just tried to use CentOS-6.4-x86_64-minimal.iso, but it does not work unmodified. The grub commands used by the ISO for installation/rescue are: kernel /images/pxeboot/vmlinuz ... initrd /images/pxeboot/initrd.img These paths do not exist on disk. If I manually correct these to: kernel /images/vmlinuz ... initrd /images/initrd.img The installation is able to proceed normally. Thanks, Adam Bishop Systems Development Specialist gpg: 0x6609D460 Janet, the UK's research and education network. Janet(UK) is a trading name of Jisc Collections and Janet Limited, a not-for-profit company which is registered in England under No. 2881024 and whose Registered Office is at Lumen House, Library Avenue, Harwell Oxford, Didcot, Oxfordshire. OX11 0SG. VAT No. 614944238

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Kickstart just create /boot, recommended swap and / with whatever is left.
by Drew Weaver 03 Apr '13

03 Apr '13

Howdy, The default partitioning scheme appears to be: swap /boot / small amount of space /home remainder of space. Is there any way via kickstart to have it just create swap with the recommended size, /boot, and then just / with the remainder without manually specifying the names of the lvs/vgs etc? I figured there would be an autopart -atomic option but that doesn't seem to exist. Any advice? Thanks, -Drew

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[SOLVED] it was an iptables-config setting, was Re: Vsftpd configuration problem
by Max Pyziur 02 Apr '13

02 Apr '13

On Tue, 2 Apr 2013, Reindl Harald wrote: > > > Am 02.04.2013 02:04, schrieb Max Pyziur: >>> [root@srv-rhsoft:~]$ cat /etc/sysconfig/iptables-config >>> # Load additional iptables modules (nat helpers) >>> # Default: -none- >>> # Space separated list of nat helpers (e.g. 'ip_nat_ftp ip_nat_irc'), which >>> # are loaded after the firewall rules are applied. Options for the helpers are >>> # stored in /etc/modprobe.conf. >>> IPTABLES_MODULES="nf_conntrack_ftp nf_nat_ftp" >> >> So, are you saying this last line is key? > > it is on my fedora machines acting as FTP behind a NAT > >> Because on the CentOS 5 setup I see: >> IPTABLES_MODULES="ip_conntrack_netbios_ns ip_conntrack_ftp" >> >> While on the CentOS 6 setup I see: >> IPTABLES_MODULES="" >> >> What is the correct/recommended setting? > > there is no "correct/recommended setting" > > if you are behind a NAT you need a different config as if you are > have a public IP on your machine, that is why configs exists Not behind a NAT ... > with passive FTP the server anserwers with port AND ip-address > for the data-connection (which is a idiotic design but it is how > it is) and if the client follows this response it fails > > so the way to go is translate the response in whatever > stateful filter in fornt of the FTP server > > this is called ALG (application layer gateway) and part > of any relieable stateful packet filter Adding the following line to /etc/sysconfig/iptables-config "got me home:" IPTABLES_MODULES="ip_conntrack_ftp" Along with the above dialogue, the following page helped (me): http://www.linuxquestions.org/questions/linux-networking-3/iptables-configu… Thanks. Max Pyziur pyz(a)brama.com

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Re: [CentOS] Vsftpd configuration problem
by Max Pyziur 02 Apr '13

02 Apr '13

On Tue, 2 Apr 2013, Reindl Harald wrote: > > > Am 02.04.2013 01:25, schrieb Max Pyziur: >> On Tue, 2 Apr 2013, Reindl Harald wrote: >> >>> >>> >>> Am 02.04.2013 01:12, schrieb Max Pyziur: >>>> Beginning today, I started to receive the following when ftp'ing to my >>>> CentOS 6 machine: >>>> ncftp /home/pyz2 > dir >>>> connect failed: No route to host. >>>> connect failed: No route to host. >>>> connect failed: No route to host. >>>> Falling back to PORT instead of PASV mode. >>>> >>>> I can make a connection, but I can't get a directory listing or transfer >>>> data/files >>>> >>>> My firewall setting has port 21 open >>>> >>>> I can remotely telnet to hostname 21 >>> >>> and you understood that ftp needs also a data-channel >>> and not only the control-connection? >> >> I assume that you are referring to the following vsftpd configuration file setting: >> # Make sure PORT transfer connections originate from port 20 (ftp-data). >> connect_from_port_20=YES > > no - port 20 has NOTHING t do with passive FTP > >> Btw, When ftping to another user on the same machine, there is no problem in >> making a connection or in transferring data > > beause it is nor firewalled nor NAted > >> it's connections that our outside the box. > > i bet you are behind a nat > > iptables or the firewall needs to translate he answers of the servers > you need to read some documentations how FTP works and how NAT > works to undersatdn the details Ok. > [root@srv-rhsoft:~]$ cat /etc/sysconfig/iptables-config > # Load additional iptables modules (nat helpers) > # Default: -none- > # Space separated list of nat helpers (e.g. 'ip_nat_ftp ip_nat_irc'), which > # are loaded after the firewall rules are applied. Options for the helpers are > # stored in /etc/modprobe.conf. > IPTABLES_MODULES="nf_conntrack_ftp nf_nat_ftp" So, are you saying this last line is key? Because on the CentOS 5 setup I see: IPTABLES_MODULES="ip_conntrack_netbios_ns ip_conntrack_ftp" While on the CentOS 6 setup I see: IPTABLES_MODULES="" What is the correct/recommended setting? >>> http://slacksite.com/other/ftp.html > > Max Pyziur pyz(a)brama.com

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C5-C6 Migration problem: HTML-Formatted email in Squirrelmail disappears
by Max Pyziur 02 Apr '13

02 Apr '13

Greetings, In Squirrelmail, you can install a plugin html_mail, that allows you to compose html-formatted email. This plugin functions with Firefox and Internet Explorer; it doesn't function in Google Chrome. In CentOS 5 with PHP5.1, I could copy and paste html-formatted text with complicated html (tables, css, etc) from a text editor into the the html-formatting pane of squirrelmail, and the message would be delivered as html-formatted to the recipients. In CentOS 6, with PHP5.3, using Squirrelmail with the html_mail plugin, copying html-formatted text from a text editor into the html-window in Squirrelmail, the delivered email only shows the header information. Using pine, I see that there is an attachment, viewing the attachment, I see the original html code that was composed in a text editor. Viewing this same received email in a web-based client (Gmail or Squirrelmail), all of html-formatting disappears. Any suggestions on how to troubleshoot and resolve this? Much thanks. Max Pyziur pyz(a)brama.com

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The annoying task_setrlimit
by m.roth＠5-cent.us 02 Apr '13

02 Apr '13

I found the FAQ about it. Unfortunately, it is going to worry some few of my users. The FAQ does *not* mention any way to shut it up. Clues?

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Vsftpd configuration problem
by Max Pyziur 02 Apr '13

02 Apr '13

Greetings, Beginning today, I started to receive the following when ftp'ing to my CentOS 6 machine: ncftp /home/pyz2 > dir connect failed: No route to host. connect failed: No route to host. connect failed: No route to host. Falling back to PORT instead of PASV mode. I can make a connection, but I can't get a directory listing or transfer data/files. I'm flummoxed. What I had been doing is adding more directives to my /etc/hosts.deny file, today to include certain categories of ip addresses for the vsftpd service. I unwound that after I saw the problem starting to occur, and have restarted vsftpd several times. That hasn't changed the above issue. And yes, I've googled. My firewall setting has port 21 open. I can remotely telnet to hostname 21 and I get a response indicating that the port is open. Any advice would be appreciated. Much thanks. Max Pyziur pyz(a)brama.com

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Re: [CentOS] Vsftpd configuration problem
by Max Pyziur 01 Apr '13

01 Apr '13

On Mon, 1 Apr 2013, lists-centos wrote: > > > ------------ Original Message ------------ >> Date: Monday, April 01, 2013 07:12:53 PM -0400 >> From: Max Pyziur <pyz(a)brama.com> >> To: centos(a)centos.org >> Cc: >> Subject: [CentOS] Vsftpd configuration problem >> >> >> Greetings, >> >> Beginning today, I started to receive the following when ftp'ing >> to my CentOS 6 machine: >> ncftp /home/pyz2 > dir >> connect failed: No route to host. >> connect failed: No route to host. >> connect failed: No route to host. >> Falling back to PORT instead of PASV mode. >> >> I can make a connection, but I can't get a directory listing or >> transfer data/files. >> >> I'm flummoxed. >> >> What I had been doing is adding more directives to my >> /etc/hosts.deny file, today to include certain categories of ip >> addresses for the vsftpd service. >> >> I unwound that after I saw the problem starting to occur, and have >> restarted vsftpd several times. >> >> That hasn't changed the above issue. >> >> And yes, I've googled. >> >> My firewall setting has port 21 open. >> >> I can remotely telnet to hostname 21 >> >> and I get a response indicating that the port is open. >> >> Any advice would be appreciated. >> >> Much thanks. >> >> Max Pyziur >> pyz(a)brama.com > > ftp uses port 21 for the "connection" and port 20 for the "data", > which includes directory listings as well as the file transfer > proper - see /etc/services. so if you have port 20 blocked that > would explain your problem. Does port 20 have to be open in the firewall? If so, this would be the first machine where I have explicitly set this. > - Richard > > > Max

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Re: [CentOS] Vsftpd configuration problem
by Max Pyziur 01 Apr '13

01 Apr '13

On Tue, 2 Apr 2013, Reindl Harald wrote: > > > Am 02.04.2013 01:12, schrieb Max Pyziur: >> Beginning today, I started to receive the following when ftp'ing to my >> CentOS 6 machine: >> ncftp /home/pyz2 > dir >> connect failed: No route to host. >> connect failed: No route to host. >> connect failed: No route to host. >> Falling back to PORT instead of PASV mode. >> >> I can make a connection, but I can't get a directory listing or transfer >> data/files >> >> My firewall setting has port 21 open >> >> I can remotely telnet to hostname 21 > > and you understood that ftp needs also a data-channel > and not only the control-connection? I assume that you are referring to the following vsftpd configuration file setting: # Make sure PORT transfer connections originate from port 20 (ftp-data). connect_from_port_20=YES Btw, When ftping to another user on the same machine, there is no problem in making a connection or in transferring data; it's connections that our outside the box. > http://slacksite.com/other/ftp.html > > MP

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[Possibly OT] - General question: state of internet traffic
by Max Pyziur 01 Apr '13

01 Apr '13

Greetings, I've read reports that there has been degradation in Internet traffic over the last month. Until today, I haven't experienced any. However, getting bank record data from chase.com here in NYC seems impossible. I also noticed erratic ftp behavior today; connections can be made but data can't be transferred. This isn't consistent, though. (I have a machine in LA while being in NYC; ftp traffic is difficult to establish westbound; no problem eastbound). I haven't done any sort of consistent test, so I am not sounding alarms. I'm just trying to get a sense of where this is happening. And is there a reliable source of information. Much thanks Max Pyziur pyz(a)brama.com

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