<span>Mac Read-only file system</span>

• 在用pecl安装PHP扩展的时候，提示如下异常：

Build process completed successfully
Installing '/usr/lib/php/extensions/no-debug-non-zts-20180731/rdkafka.so'
ERROR: failed to write /usr/lib/php/extensions/no-debug-non-zts-20180731/rdkafka.so (copy(/usr/lib/php/extensions/no-debug-non-zts-20180731/rdkafka.so): failed to open stream: Read-only file system)

• php -m命令查看安装结果，发现也是失败的。

• 原因是rdkafka.so文件无法写入指定扩展目录，提示：Read-only file system。

• 那就需要给这个文件权限，执行如下命令，关闭安全模式：

sudo mount -uw /

• 再次执行安装命令

pecl install rdkafka

Build process completed successfully
Installing '/usr/lib/php/extensions/no-debug-non-zts-20180731/rdkafka.so'
install ok: channel://pecl.php.net/rdkafka-4.0.3
configuration option "php_ini" is not set to php.ini location
You should add "extension=rdkafka.so" to php.ini