Tai Squared's questions

I have a server that multiple users access via sftp. They do not have ssh access and they are contained to their home directory by setting the ChrootDirectory /home/%u in the /etc/ssh/sshd_config file. I want one user to be able to access an entire directory containing files uploaded by another user. I tried creating a symlink: ln -s /home/user2/files /home/user1/other_files but when user1 logs in, they can see the link but not navigate to it. If I ssh into the box, I can use the other_files symlink to see the uploaded files, but the sftp users cannot (they get a permisisons error when accessing).

Can I allow these users to share files automatically while still containing them to their home directory? I know the symlink points to a path outside of their directory, which I believe is causing the permission issue. I can't manually move the files - the uploads are automatic and occur frequently, so I need user1 to be able to see the files as soon as they're uploaded. If I recreate the users with the same home directory and adjust the permissions of their respective upload directorys, would that allow user 1 to get the files? Ideally, user 2 shouldn't have access to any of user 1's files, but if that has to happen, it will still work for me.

When I try to send an email on my postfix server to an address on the same domain (for example, if the server hostname is mail.example.com and I try to send an email to [email protected]), I get the following error in the log and the email is not delivered: Recipient address rejected: User unknown in local recipient table. If I send to an address on another domain, I don't have any problems. Here is my /etc/postfix/main.cf file:

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no
# appending .domain is the MUA's job.
append_dot_mydomain = no
# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h
readme_directory = no
# TLS parameters
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.
myhostname = mail.example.com
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
#myorigin = /etc/mailname
myorigin = $mydomain
mydestination = $mydomain, localhost.$mydomain, localhost
relayhost =
#fake IP address
mynetworks = 127.0.0.0/8 100.837.191.223
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all

I have a Java web app deployed on Tomcat 6 on Ubuntu 9.04. For certain images, I want to create a symbolic link to another directory of images. This will allow me to reference images that remain on the server even if the application is removed and redeployed.

The application is deployed in the /var/lib/tomcat6/webapps/ROOT/ directory and the images directory exists in the war. When I deploy the application, I create a symbolic link to the saved_images directory so there is a path like /var/lib/tomcat6/webapps/ROOT/images/saved_images/.

In the application, I have the following code:

File file = new File("/var/lib/tomcat6/webapps/ROOT/images/saved_images/abc.jpg");
boolean fileExists = file.exists();

The fileExists value is true when the code runs, but the images aren't displayed on the page when referenced like images/saved_images/abc.jpg.

The permissions of the images in the /var/lib/tomcat6/webapps/ROOT/images and /var/lib/tomcat6/webapps/ROOT/images/saved_images are the same (the owner and group is tomcat6, which is the same as the other files deployed in the war). If I remove the sym link and put the saved_images files in a directory of the same name, the images are displayed. How can I have the page display these images when the directory is a sym link without having to copy the files to a real directory?

When I remote desktop into one Windows Server 2003 machine, I get a popup message saying "The security log on this system is full." When I open the Event Viewer, the security log size is 512.0 KB, which is the same as the Application and System logs. What is causing that message, and how can I clear the log to avoid it?

I'm receiving a PFN_LIST_CORRUPT BSOD after a few minutes of using my Dell D600 laptop (running Windows XP). Based on my searches, it seems this is typically related to bad RAM. I haven't had other problems, and nothing has changed on this computer. Could it be that one of the RAM chips has come unseated, or is it just corrupted and I should get a new one?