CentOS 6 无法安装 Swoole 提示 GCC 4.8 or later required

自行编译安装 gcc,依然提示,

当使用 gcc -v 提示已安装 gcc version 4.8.2

但使用 yum install gcc 提示是 4.4 且为最新版本

解决办法,卸载 yum 版 gcc,然后重新编译安装

yum remove gcc

CentOS 6 升级安装gcc 4.8


1. 导入CERN’s GPG key

rpm --import http://linuxsoft.cern.ch/cern/slc68/x86_64/RPM-GPG-KEY-cern

2. 添加slc6-devtoolset yum源

wget -O /etc/yum.repos.d/slc6-devtoolset.repo http://linuxsoft.cern.ch/cern/devtoolset/slc6-devtoolset.repo

3. 安装devtoolset-2

yum install devtoolset-2

4. 生效devtoolset-2

source /opt/rh/devtoolset-2/enable


echo 'source /opt/rh/devtoolset-2/enable' >> ~/.bashrc


$ gcc --version
gcc (GCC) 4.8.2 20140120 (Red Hat 4.8.2-15)

CentOS7 GIF 压缩 Gifsicle 安装

Gifsicle 官网

cd ~
wget https://www.lcdf.org/gifsicle/gifsicle-1.91.tar.gz 
tar -zxvf gifsicle-1.91.tar.gz
cd gifsicle-1.91/
make install


gifsicle -O3 path.gif -o newpath.gif
[root@instance-jewlel2q tmp]# gifsicle --sinfo x.gif
* x.gif 98 images
  logical screen 800x450
  global color table [256]
  background 0
  loop forever
  + image #0 800x450
    compressed size 133044
    comment Edited with ezgif.com online GIF maker
    disposal asis delay 0.10s
  + image #1 800x450
    compressed size 133243
    local color table [256]
    disposal asis delay 0.10s
  + image #2 800x450
    compressed size 134192
    local color table [256]
    disposal asis delay 0.10s
  + image #3 800x450
    compressed size 130221
    local color table [256]
    disposal asis delay 0.10s
[root@instance-jewlel2q tmp]# gifsicle -O3 x.gif -o x1.gif --resize-fit 400
gifsicle: invalid dimensions ‘400’ (want WxH)
gifsicle: warning: too many colors, using local colormaps
  (You may want to try ‘--colors 256’.)
[root@instance-jewlel2q tmp]# gifsicle -h
'Gifsicle' manipulates GIF images. Its most common uses include combining
single images into animations, adding transparency, optimizing animations for
space, and printing information about GIFs.

Usage: gifsicle [OPTION | FILE | FRAME]...

Mode options: at most one, before any filenames.
  -m, --merge                   Merge mode: combine inputs, write stdout.
  -b, --batch                   Batch mode: modify inputs, write back to
                                same filenames.
  -e, --explode                 Explode mode: write N files for each input,
                                one per frame, to 'input.frame-number'.
  -E, --explode-by-name         Explode mode, but write 'input.name'.

General options: Also --no-OPTION for info and verbose.
  -I, --info                    Print info about input GIFs. Two -I's means
                                normal output is not suppressed.
      --color-info, --cinfo     --info plus colormap details.
      --extension-info, --xinfo --info plus extension details.
      --size-info, --sinfo      --info plus compression information.
  -V, --verbose                 Prints progress information.
  -h, --help                    Print this message and exit.
      --version                 Print version number and exit.
  -o, --output FILE             Write output to FILE.
  -w, --no-warnings             Don't report warnings.
      --no-ignore-errors        Quit on very erroneous input GIFs.
      --conserve-memory         Conserve memory at the expense of speed.
      --multifile               Support concatenated GIF files.

Frame selections:               #num, #num1-num2, #num1-, #name

Frame change options:
  --delete FRAMES               Delete FRAMES from input.
  --insert-before FRAME GIFS    Insert GIFS before FRAMES in input.
  --append GIFS                 Append GIFS to input.
  --replace FRAMES GIFS         Replace FRAMES with GIFS in input.
  --done                        Done with frame changes.

Image options: Also --no-OPTION and --same-OPTION.
  -B, --background COL          Make COL the background color.
      --crop X,Y+WxH, --crop X,Y-X2,Y2
                                Crop the image.
      --crop-transparency       Crop transparent borders off the image.
      --flip-horizontal, --flip-vertical
                                Flip the image.
  -i, --interlace               Turn on interlacing.
  -S, --logical-screen WxH      Set logical screen to WxH.
  -p, --position X,Y            Set frame position to (X,Y).
      --rotate-90, --rotate-180, --rotate-270, --no-rotate
                                Rotate the image.
  -t, --transparent COL         Make COL transparent.

Extension options:
      --app-extension N D       Add an app extension named N with data D.
  -c, --comment TEXT            Add a comment before the next frame.
      --extension N D           Add an extension number N with data D.
  -n, --name TEXT               Set next frame's name.
      --no-comments, --no-names, --no-extensions
                                Remove comments (names, extensions) from input.
Animation options: Also --no-OPTION and --same-OPTION.
  -d, --delay TIME              Set frame delay to TIME (in 1/100sec).
  -D, --disposal METHOD         Set frame disposal to METHOD.
  -l, --loopcount[=N]           Set loop extension to N (default forever).
  -O, --optimize[=LEVEL]        Optimize output GIFs.
  -U, --unoptimize              Unoptimize input GIFs.
  -j, --threads[=THREADS]       Use multiple threads to improve speed.

Whole-GIF options: Also --no-OPTION.
      --careful                 Write larger GIFs that avoid bugs in other
      --change-color COL1 COL2  Change COL1 to COL2 throughout.
  -k, --colors N                Reduce the number of colors to N.
      --color-method METHOD     Set method for choosing reduced colors.
  -f, --dither                  Dither image after changing colormap.
      --gamma G                 Set gamma for color reduction [2.2].
      --resize WxH              Resize the output GIF to WxH.
      --resize-width W          Resize to width W and proportional height.
      --resize-height H         Resize to height H and proportional width.
      --resize-fit WxH          Resize if necessary to fit within WxH.
      --scale XFACTOR[xYFACTOR] Scale the output GIF by XFACTORxYFACTOR.
      --resize-method METHOD    Set resizing method.
      --resize-colors N         Resize can add new colors up to N.
      --transform-colormap CMD  Transform each output colormap by shell CMD.
      --use-colormap CMAP       Set output GIF's colormap to CMAP, which can
                                be 'web', 'gray', 'bw', or a GIF file.

Report bugs to <ekohler@gmail.com>.
Too much information? Try 'gifsicle --help | more'.

监测 MySQL 服务 挂掉自动重启

最近 MySQL 服务总是挂掉

cd ~
vim /mysqllisten.sh
pgrep -x mysqld &> /dev/null
if [ $? -ne 0 ]
echo "MySQL stoped at time: `date` ">> /home/wwwlogs/mysql_messages
/etc/init.d/mysql restart
sleep 15s
MYSQLPORT=`netstat -na|grep "LISTEN"|grep "3306"|awk -F[:" "]+ '{print $4}'`
    if [ "$MYSQLPORT" == "3306" ]
            echo "MySQL restart successful at time: `date` ">> /home/wwwlogs/mysql_messages   
            echo "MySQL restart failed at time: `date` ">> /home/wwwlogs/mysql_messages 
            mail -s "wann! yourwebsitedomain's mysql restart failed" 这里写你的邮箱地址
echo "MySQL server is running"
chmod +x ./mysqllisten.sh


crontab -e

*/10 * * * * /bin/bash /root/mysqllisten.sh

service crond restart



Swoole 编译报错 fatal error: hiredis/hiredis.h: No such file or directory

Swoole 当使用参数 –enable-async-redis 时编译报错

/tmp/pear/temp/swoole/swoole_redis.c:20:29: fatal error: hiredis/hiredis.h: No such file or directory

启用 Swoole 的 async-redis 扩展需要安装 hiredis,hiredis 需要 redis

安装 Redis

cd ~
wget http://download.redis.io/releases/redis-5.0.0.tar.gz
tar xzf redis-5.0.0.tar.gz
cd redis-5.0.0

安装 hiredis

cd ~
wget https://github.com/redis/hiredis/archive/v0.13.3.zip
unzip v0.13.3.zip
cd hiredis-0.13.3
make -j
sudo make install
sudo ldconfig

Swoole 编译错误 Enable http2 support, require nghttp2 library

安装 nghttp2

In file included from /tmp/pear/temp/swoole/swoole.c:16:0:
/tmp/pear/temp/swoole/php_swoole.h:142:2: error: #error "Enable http2 support, require nghttp2 library."
 #error "Enable http2 support, require nghttp2 library."

swoole 的 http2 模块依赖  nghttp2库,安装即可

wget https://github.com/nghttp2/nghttp2/releases/download/v1.30.0/nghttp2-1.30.0.tar.bz2 
tar -jxvf nghttp2-1.30.0.tar.bz2 
cd nghttp2-1.30.0 
make install

安装 PostgreSQL


configure: error: Cannot find libpq-fe.h. Please confirm the libpq or specify correct PostgreSQL(libpq) installation path
ERROR: `/tmp/pear/temp/swoole/configure --with-php-config=/usr/local/php/bin/php-config --enable-sockets=yes --enable-openssl=yes --enable-http2=yes --enable-mysqlnd=yes --enable-coroutine-postgresql=yes --enable-debug-log=yes' failed


yum -y install postgresql-devel