Build ChromiumOS

Nov 5, 2014
Technology

First Time Build

This build failed for I could not get the repository sync.

I setup the environment on 159’s /media/nfs:

$ git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
$ export PATH="$PATH":`pwd`/depot_tools
$ echo $PATH
/home/ubuntu/bin:/home/ubuntu/bin:/home/ubuntu/bin:/home/ubuntu/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/media/nfs/ChromiumOS/depot_tools
$ cat script.sh 
#!/bin/sh
cat >./sudo_editor<<EOF
#!/bin/sh
echo Defaults !tty_tickets > $1
echo Defaults timestamp_timeout=180 >> $1
EOF
chmod +x ./sudo_editor
sudo EDITOR=./sudo_editor visudo -f /etc/sudoers.d/relax_requirements
$ export BOARD=x86-generic
$ repo init -u https://git.chromium.org/chromiumos/manifest.git
$ repo sync

Second Time Build

Trusty@Linux59:~/Code/ChromiumOS> pwd
/home/Trusty/Code/ChromiumOS
Trusty@Linux59:~/Code/ChromiumOS>  git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
Trusty@Linux59:~/Code/ChromiumOS> export PATH=`pwd`/depot_tools:"$PATH"
Trusty@Linux59:~/Code/ChromiumOS> mkdir chromiumos
Trusty@Linux59:~/Code/ChromiumOS> cd chromiumos/
Trusty@Linux59:~/Code/ChromiumOS/chromiumos> repo init -u https://chromium.googlesource.com/chromiumos/manifest.git --repo-url https://chromium.googlesource.com/external/repo.git 
Trusty@Linux59:~/Code/ChromiumOS/chromiumos> repo sync
Trusty@Linux59:~/Code/ChromiumOS/chromiumos> cros_sdk
root's password:
(cr) ((c405e7b...)) Trusty@Linux59 ~/trunk/src/scripts $ export BOARD=x86-generic
(cr) ((c405e7b...)) Trusty@Linux59 ~/trunk/src/scripts $ ./setup_board --board=${BOARD}
# ./set_shared_user_password.sh
# ./build_packages --board=${BOARD}

Build OpenWRT For X86

Nov 5, 2014
Technology

Prepare

Install following packages:

$ sudo apt-get install build-essential subversion git-core libncurses5-dev zlib1g-dev gawk flex quilt libssl-dev xsltproc libxml-parser-perl

Code

Get the source code from OpenWRT.org:

$ git clone git://git.openwrt.org/openwrt.git

Then Prepare for menuconfig:

$ cd openwrt
$ ./scripts/feeds update -a
$ ./scripts/feeds install -a
$ make menuconfig

Select x86 for Target System.
[] ext4–> Target Images –> ext4
[] Build VMware image files (VMDK)

You could also select for VDI or other formats.

Luci- > collection - > select luci.

Then we could type make for making out the images.

Enable nfs server of 53

Nov 5, 2014
Technology

Only enabled the nfs server and use the max disk for building, the nfs server runs Redhat RHEL6.2, the same procedure could be applied to CentOS Based system.
Steps:
Query for installed packages in server:

$ rpm -qa nfs-utils
$ rpm -qa rpcbind

Edit the nfs based directory:

# cat /etc/exports
/home/Trusty/share/       *(rw,sync,no_subtree_check,no_root_squash)

Start the service and test:

# service rpcbind start
# service nfs start

In client machine, just type following command for mount the remote nfs directory:

$ sudo mount -t nfs 1xx.xxx.xxx.xx:/home/Trusty/share /mnt/

Make nfs server automatically start when system boot:

# chkconfig nfs on
# chkconfig rpcbind on

Client Machine(59), do following for automatically mount nfs:

$ vim /etc/fstab
# Using NFS
1xx.xxx.xxx.xx:/home/Trusty/share /media/nfs/     nfs     rsize=8192,wsize=8192,timeo=14,intr     0       0
$ mount -a

Then everytime this clent machine startup the remote nfs directory will be mounted to local directory.

If you are ubuntu client, then you should install nfs-client via;

sudo apt-get install nfs-common

MySQL creashes on DigitalOcean

Nov 5, 2014
Technology

Problem

The mysql server always keep crash, with following log under /var/log/mysql/error.log:

141104 23:06:46 InnoDB: Fatal error: cannot allocate memory for the buffer pool

So this is the memory problem, we should allocate more memory for our VPS.

Solution

Add swap partition:
First check the swap partition:

root@xxx:/var/log# free -m
             total       used       free     shared    buffers     cached
Mem:           490        464         25         28         61        172
-/+ buffers/cache:        230        259
Swap:            0          0          0
root@xxx:/var/log# swapon -s
Filename                                Type            Size    Used    Priority

Now create a swapfile:

# dd if=/dev/zero of=/swapfile bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 2.16285 s, 496 MB/s
# ls /swapfile -l -h
-rw-r--r-- 1 root root 1.0G Nov  5 00:58 /swapfile

Setting the swapfile:

root@xxx:/var/log# chmod 600 /swapfile 
root@xxx:/var/log# swapon /swapfile
swapon: /swapfile: read swap header failed: Invalid argument
root@xxx:/var/log# mkswap /swapfile
Setting up swapspace version 1, size = 1048572 KiB
no label, UUID=64b727dd-0d7e-45ff-9235-cd9ba84b062f
root@xxx:/var/log# swapon /swapfile

Now use free command you could check swap file enabled:

root@xxx:/var/log# free -m
             total       used       free     shared    buffers     cached
Mem:           490        458         31         28         25        229
-/+ buffers/cache:        204        285
Swap:         1023          0       1023

Add it permanately into the /etc/fstab:

/swapfile   none    swap    sw    0   0

Configure the parameters:

root@xxx:/var/log# cat /proc/sys/vm/swappiness
60
root@xxx:/var/log# sysctl vm.swappiness=10
vm.swappiness = 10                                                                                      
root@xxx:/var/log# cat /proc/sys/vm/swappiness                                                  
10                                                
root@xxx:/var/log# vim /etc/sysctl.conf
vm.swappiness=10
vm.vfs_cache_pressure = 50
root@xxx:/var/log# cat /proc/sys/vm/vfs_cache_pressure                                          
100                                         
root@xxx:/var/log# cat /proc/sys/vm/vfs_cache_pressure                                          
50

Now the mysql server should be good.

Disable the login password.

# vim /etc/apache2/apache2.conf
#<DirectoryMatch ^.*/wp-admin/>
#    AuthType Basic
#    AuthName "Please login to your droplet via SSH for login details."
#    AuthUserFile /etc/apache2/.htpasswd
#    Require valid-user
#<DirectoryMatch>
root@xxx:~# service apache2 restart
 * Restarting web server apache2

Change the password for login details

$ htpasswd .htpasswd user2

OpenWRT on BBB(2)

Nov 4, 2014
Technology

Cheetsheet For Using NFS

Following configuration use the 192.168.1.221’s tftp server and 192.168.1.11’s nfs server, why I use different nfs server because 192.168.1.11 runs ubuntu and could reached by nfs client easily.

setenv ipaddr 192.168.1.16
setenv serverip 192.168.1.221
tftpboot ${fdtaddr} am335x-boneblack.dtb
tftpboot ${kloadaddr} uImage
setenv bootargs console=ttyO0,115200n8 root=/dev/nfs rw nfsroot=192.168.1.11:/srv/nfs4/BBBrootfs ip=192.168.1.1 rootwait
bootm ${kloadaddr} - ${fdtaddr}

How to start more services

Current we only got following output:

procd: - init -
//.......
procd: - init complete -

From the Kernel Source code we know the init startup sequence:

$ cd /media/y/embedded/BBB/svnco/trunk/build_dir/target-arm_cortex-a9+vfpv3_uClibc-0.9.33.2_eabi/linux-omap/linux-3.14.4
$ cd init
$ vim main.c
if (!try_to_run_init_process("/etc/preinit") ||
	    !try_to_run_init_process("/sbin/init") ||
	    !try_to_run_init_process("/etc/init") ||
	    !try_to_run_init_process("/bin/init") ||
	    !try_to_run_init_process("/bin/sh"))
		return 0;

The preinit is called by /etc/preinit, while in this file, we found:

for pi_source_file in /lib/preinit/*; do
        . $pi_source_file
done

This means all of the preinit script is listed under NFS Server’s /lib/preinit/ folder.

Add our own preinit startup file:

[root@TrustyArch preinit]# ls
02_default_set_state  30_failsafe_wait             70_initramfs_test  90_init_console~
10_indicate_failsafe  40_run_failsafe_hook         80_mount_root      99_10_failsafe_login
10_indicate_preinit   50_indicate_regular_preinit  90_init_console    99_10_run_init
[root@TrustyArch preinit]# vim 90_init_console
#!/bin/sh
# Copyright (C) 2006-2010 OpenWrt.org
# Copyright (C) 2010 Vertical Communications

init_console() {
    preinit_echo "Called 90_init_console here!"
    if [ "$pi_suppress_stderr" = "y" ]; then
        exec <$M0 >$M1 2>&0
    else 
        exec <$M0 >$M1 2>$M2
    fi
}

boot_hook_add preinit_essential init_console
[root@TrustyArch preinit]# chmod 777 90_init_console
[root@TrustyArch preinit]# rm -f 90_init_console~

Now restart the BBB, to see if really take effects.
Also add a new file named 50_choose_console, with the setted M0 and M1, you could get your console.

$ cat 50_choose_console
#!/bin/sh
# Copyright (C) 2006-2010 OpenWrt.org
# Copyright (C) 2010 Vertical Communications

choose_console() {
    # the shell really doesn't like having stdin/out closed
    # that's why we use /dev/pty/m0 and m1 (or equivalent) as replacement
    # for /dev/console if there's no serial console available

    if grep -q devfs /proc/filesystems; then
        M0=/dev/pty/m0
        M1=/dev/pty/m1
        M2=/dev/pty/m1
    elif [ -x /sbin/hotplug2 ]; then
        M0=/dev/ptmx
        M1=/dev/ptmx
        M2=/dev/ptmx
    elif [ -x /sbin/udevd ]; then
        M0=/dev/pty/ptmx
        M1=/dev/pty/ptmx
        M2=/dev/pty/ptmx
    fi
    dd if=/dev/console of=/dev/null bs=1 count=0 >/dev/null 2>/dev/null && {
        M0=/dev/console
        M1=/dev/console
        M2=/dev/console    
    }
}

boot_hook_add preinit_essential choose_console

But I still cannot get the terminal.

很惭愧，就做了一点微小的工作

Build ChromiumOS

First Time Build

Second Time Build

Build OpenWRT For X86

Prepare

Code

Enable nfs server of 53

MySQL creashes on DigitalOcean

Problem

Solution

Disable wp-admin login password

OpenWRT on BBB(2)

Cheetsheet For Using NFS

How to start more services