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msfdb启动报错”Attempting to start MSF web service…failed”解决方法

1.查看~/.msf4/msf-ws.log，如果是

dyld: lazy symbol binding failed: Symbol not found: _SSL_library_init
Referenced from: /Users/xxxx/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/eventmachine-1.2.7/lib/rubyeventmachine.bundle
Expected in: flat namespace

手动指定ssl包含文件路径并重新安装eventmachine

gem uninstall eventmachine
gem install eventmachine -v '1.2.7' -- --with-cppflags=-I$(brew --prefix openssl)/include

1 2	gem uninstall eventmachine gem install eventmachine -v '1.2.7' -- --with-cppflags=-I$(brew --prefix openssl)/include

2.再次启动msfdb，发现报错

objc[4443]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called.
objc[4443]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.

这是macOS对objc多线程的限制，修改环境变量解决问题

export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES

1	export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES

Copying an operating system image to an SD card using Mac OS

https://www.raspberrypi.org/documentation/installation/installing-images/mac.md

Note: The use of the dd tool can overwrite any partition of your machine. If you specify the wrong device in the instructions, you could overwrite your primary Mac OS partition!

Determine SD device

Insert the SD card in the slot or connect the SD card reader with the SD card inside.
diskutil list
or
From the Apple menu, choose ‘System Report’, then click on ‘More info…’.
Click on ‘USB’ (or ‘Card Reader’ if you are using a built-in SD card reader), then search for your SD card in the upper right section of the window. Click on it, then search for the BSD name in the lower right section. It is in the form diskN (for example, disk4). Record this name.
using Disk Utility, unmount the partition. Do not eject it.

Copy the image

From Terminal, enter:

sudo dd bs=1m if=path_of_your_image.img of=/dev/rdiskN conv=sync

1

sudo dd bs=1m if=path_of_your_image.img of=/dev/rdiskN conv=sync

Replace N with the number that you noted before.

This can take more than 15 minutes, depending on the image file size. Check the progress by pressing Ctrl+T.

If the command reports dd: bs: illegal numeric value, change the block size bs=1m to bs=1M.

If the command reports dd: /dev/rdisk2: Operation not permitted you need to disable SIP before continuing.

If the command reports the error dd: /dev/rdisk3: Permission denied, the partition table of the SD card is being protected against being overwritten by Mac OS. Erase the SD card’s partition table using this command:

sudo diskutil partitionDisk /dev/diskN 1 MBR "Free Space" "%noformat%" 100%

1

sudo diskutil partitionDisk /dev/diskN 1 MBR "Free Space" "%noformat%" 100%

That command will also set the permissions on the device to allow writing. Now issue the dd command again.

After the `dd` command finishes, eject the card:

sudo diskutil eject /dev/rdiskN

1	sudo diskutil eject /dev/rdiskN

使用aws-cli更新lightsail mysql时区

https://forums.aws.amazon.com/thread.jspa?threadID=307496

https://lightsail.aws.amazon.com/ls/docs/en_us/articles/amazon-lightsail-updating-database-parameters

1.通过get-relational-database-parameters查询可用参数

aws lightsail get-relational-database-parameters --relational-database-name DatabaseName

1	aws lightsail get-relational-database-parameters --relational-database-name DatabaseName

2.通过update-relational-database-parameters更新参数

aws lightsail update-relational-database-parameters --relational-database-name xxxx --parameters "parameterName=time_zone,applyMethod=pending-reboot,parameterValue=Asia/Shanghai"

1	aws lightsail update-relational-database-parameters --relational-database-name xxxx --parameters "parameterName=time_zone,applyMethod=pending-reboot,parameterValue=Asia/Shanghai"

svn服务脚本

#!/bin/sh
if [ true != "$INIT_D_SCRIPT_SOURCED" ] ; then
set "$0" "$@"; INIT_D_SCRIPT_SOURCED=true . /lib/init/init-d-script
fi
### BEGIN INIT INFO
# Provides:          svnserve
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: svnserve init script
# Description:       bare minimum svn init script
### END INIT INFO
DESC="subversion server"
DAEMON=/usr/bin/svnserve
DAEMON_ARGS="-d -r /data/svn --log-file /var/log/svn.log"

#!/bin/sh

if [ true != "$INIT_D_SCRIPT_SOURCED" ] ; then

set "$0" "[email protected]"; INIT_D_SCRIPT_SOURCED=true . /lib/init/init-d-script

### BEGIN INIT INFO

# Provides: svnserve

# Required-Start: $remote_fs $syslog

# Required-Stop: $remote_fs $syslog

# Default-Start: 2 3 4 5

# Default-Stop: 0 1 6

# Short-Description: svnserve init script

# Description: bare minimum svn init script

### END INIT INFO

DESC="subversion server"

DAEMON=/usr/bin/svnserve

DAEMON_ARGS="-d -r /data/svn --log-file /var/log/svn.log"

sudo chmod 755 /etc/init.d/svnserve
sudo update-rc.d svnserve defaults
sudo systemctl enable svnserve
sudo systemctl daemon-reload

sudo chmod 755 /etc/init.d/svnserve

sudo update-rc.d svnserve defaults

sudo systemctl enable svnserve

sudo systemctl daemon-reload

转：linux系统高并发socket最大连接数优化

https://lanjingling.github.io/2016/05/10/linux-socket-youhua1/

继续阅读转：linux系统高并发socket最大连接数优化

sql server备份所有数据库脚本

DECLARE @name VARCHAR(50) -- database name  
DECLARE @path VARCHAR(256) -- path for backup files  
DECLARE @fileName VARCHAR(256) -- filename for backup  
DECLARE @fileDate VARCHAR(20) -- used for file name
-- specify database backup directory
SET @path = 'C:\Backup\'  
-- specify filename format
SELECT @fileDate = CONVERT(VARCHAR(20),GETDATE(),112) 
DECLARE db_cursor CURSOR READ_ONLY FOR  
SELECT name 
FROM master.dbo.sysdatabases 
WHERE name NOT IN ('master','model','msdb','tempdb')  -- exclude these databases
OPEN db_cursor   
FETCH NEXT FROM db_cursor INTO @name   
WHILE @@FETCH_STATUS = 0   
BEGIN   
SET @fileName = @path + @name + '_' + @fileDate + '.BAK'  
BACKUP DATABASE @name TO DISK = @fileName  
FETCH NEXT FROM db_cursor INTO @name   
END   
CLOSE db_cursor   
DEALLOCATE db_cursor