Tang dung luong file upload cho Tomcat Apache

Problem

When uploading a WAR file larger than 50 MB, the Tomcat 7 Manager application reports:

The server encountered an internal error () that prevented it from fulfilling this request.

Exception java.lang.IllegalStateException:

org.apache.tomcat.util.http.fileupload.FileUploadBase$SizeLimitExceededException:

the request was rejected because its size (XXX) exceeds the configured maximum (52428800)
Solution

    Go to the web.xml of the manager application (for instance it could be under /tomcat7/webapps/manager/WEB-INF/web.xml.
    Increase the max-file-size and max-request-size:

<multipart-config>

<!– 50MB max –>

<max-file-size>52428800</max-file-size>

<max-request-size>52428800</max-request-size>

<file-size-threshold>0</file-size-threshold>

</multipart-config> 




Nguon Internet.

ssh, scp without password to remote host

GIỚI THIỆU
Hôm nay định viết một script để tự động copy backup dữ liệu từ local host sang 1 host khác.
Việc copy thì dễ dàng có thể dùng các lệnh scp hay rsync. Tuy nhiên vấn đề khó khăn ở đây là các lệnh trên yêu cầu phải nhập password.

Phải làm sao để thực hiện các lệnh nói trên đến remote host mà không phải nhập password thì việc backup tự động mới khả thi được.

THỰC HIỆN

Nào hãy bắt đầu. Giả sử
localhost (192.168.241.63) - Máy source cần copy data
remotehost (192.168.241.246)- Máy đích cần copy data đến để backup
1) Từ localhost tạo một ssh rsa key pair cho host validation:  

[localhost]# ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/root/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /root/.ssh/id_rsa. Your public key has been saved in /root/.ssh/id_rsa.pub. The key fingerprint is: 82:c6:21:5b:9e:07:6e:6d:3b:66:47:eb:9e:ff:6a:bd root@localhost

 2) Copy public key đến remotehost dùng scp, chú ý đừng copy private key: 

[localhost]# scp ~/.ssh/id_rsa.pub 192.168.241.246:~ The authenticity of host '192.168.241.246 (192.168.241.246)' can't be established. RSA key fingerprint is 2e:43:dd:e8:72:8a:47:91:89:7f:b9:3a:94:ca:2a:27. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '192.168.241.246' (RSA) to the list of known hosts. root@192.168.241.246's password: id_rsa.pub                                    100%  395     0.4KB/s   00:00 

 public key đã copy OK, Bắt đầu connect đến máy remotehost

3) Connect đến máy remotehost dùng ssh: 

[localhost]# ssh root@192.168.241.246 root@192.168.241.246's password: Last login: Tue Feb 22 14:13:28 2011 from 192.168.241.249 [remotehost ~]#

 4) Kiễm tra nếu .ssh có tồn tại hay không, nếu không thì tạo mới: 

[remotehost]# ls -la ~/.ssh ls: cannot access /root/.ssh: No such file or directory

 Tạo mới

[remotehost]# mkdir .ssh [remotehost]# chmod 700 .ssh

5) Copy ssh public key vào file authorized keys và xóa nó khi hoàn thành: 

[remotehost]# cat ~/id_rsa.pub >> .ssh/authorized_keys [remotehost]# chmod 600 .ssh/authorized_keys [remotehost]# rm id_rsa.pub

6) Kiểm Tra: 

[localhost]# scp test.txt root@192.168.241.246:/hdd/ test.txt                                      100%    4     0.0KB/s   00:00   

 --Suu Tam--

Migrate user account & samba user to new linux system

http://serverfault.com/questions/74370/how-to-migrate-samba-user-accounts-to-a-new-linux-server


You'll need to copy /etc/passwd, /etc/shadow, /etc/group, /etc/samba/smbusers, and /etc/samba/smbpasswd. This site shows you how to do the first 3, but I've done the last two and it worked fine.

Commands to type on old Linux system

First create a tar ball of old uses (old Linux system). Create a directory:
# mkdir /root/move/

Setup UID filter limit:
# export UGIDLIMIT=500
Now copy /etc/passwd accounts to /root/move/passwd.mig using awk to filter out system account (i.e. only copy user accounts)
# awk -v LIMIT=$UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534)' /etc/passwd > /root/move/passwd.mig
Copy /etc/group file:
# awk -v LIMIT=$UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534)' /etc/group > /root/move/group.mig
Copy /etc/shadow file:
# awk -v LIMIT=$UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534) {print $1}' /etc/passwd | tee - |egrep -f - /etc/shadow > /root/move/shadow.mig
Copy /etc/gshadow (rarely used):
# cp /etc/gshadow /root/move/gshadow.mig
Make a backup of /home and /var/spool/mail dirs:
# tar -zcvpf /root/move/home.tar.gz /home
# tar -zcvpf /root/move/mail.tar.gz /var/spool/mail
Where,

• Users that are added to the Linux system always start with UID and GID values of as specified by Linux distribution or set by admin. Limits according to different Linux distro:
• RHEL/CentOS/Fedora Core : Default is 500 and upper limit is 65534 (/etc/libuser.conf).
• Debian and Ubuntu Linux : Default is 1000 and upper limit is 29999 (/etc/adduser.conf).
• You should never ever create any new system user accounts on the newly installed Cent OS Linux. So above awk command filter out UID according to Linux distro.
• export UGIDLIMIT=500 - setup UID start limit for normal user account. Set this value as per your Linux distro.
• awk -v LIMIT=$UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534)' /etc/passwd > /root/move/passwd.mig - You need to pass UGIDLIMIT variable to awk using -v option (it assigns value of shell variable UGIDLIMIT to awk program variable LIMIT). Option -F: sets the field separator to : . Finally awk read each line from /etc/passwd, filter out system accounts and generates new file /root/move/passwd.mig. Same logic is applies to rest of awk command.
• tar -zcvpf /root/move/home.tar.gz /home - Make a backup of users /home dir
• tar -zcvpf /root/move/mail.tar.gz /var/spool/mail - Make a backup of users mail dir

Use scp or usb pen or tape to copy /root/move to a new Linux system.
# scp -r /root/move/* user@new.linuxserver.com:/path/to/location

Commands to type on new Linux system

First, make a backup of current users and passwords:
# mkdir /root/newsusers.bak
# cp /etc/passwd /etc/shadow /etc/group /etc/gshadow /root/newsusers.bak

Now restore passwd and other files in /etc/
# cd /path/to/location
# cat passwd.mig >> /etc/passwd
# cat group.mig >> /etc/group
# cat shadow.mig >> /etc/shadow
# /bin/cp gshadow.mig /etc/gshadow
Please note that you must use >> (append) and not > (create) shell redirection.
Now copy and extract home.tar.gz to new server /home
# cd /
# tar -zxvf /path/to/location/home.tar.gz
Now copy and extract mail.tar.gz (Mails) to new server /var/spool/mail
# cd /
# tar -zxvf /path/to/location/mail.tar.gz
Now reboot system; when the Linux comes back, your user accounts will work as they did before on old system:
# reboot

Lenh mount file iso tren linux

mount -o loop -t iso9660 clonezilla-live-1.2.8-42-i686.iso /mnt