LVM ext4缩容

缩减逻辑卷，xfs不支持，缩减前先unmount

e2fsck -f /dev/vg1/lv1 #检查磁盘错误 （针对ext4执行）
resize2fs /dev/vg1/lv1 100M #更新逻辑卷信息（针对ext4执行）
lvresize -L 100M /dev/vg1/lv1 #重新设定大小

作者：pcct
来源：CSDN
原文：https://blog.csdn.net/lovektm/article/details/78461453
版权声明：本文为博主原创文章，转载请附上博文链接！

学习下 

#include <stdio.h>

void pass(){
    int a=0;
    int *p=&a;
    while(1){
        if(*p==123)
            break;
        p++;
    }
    *p=456;
}

int main(){
    int x=123;
    pass();
    printf("%d\n",x);
    return 0;
}

杨龙

2018年10月20日

刚刚yum安装MySQL 8.0，直接把我的mariadb卸载了

php上传目录到阿里云oss，python上传目录到阿里云oss

首先是python版

# -*- coding: utf-8 -*-
import os

import oss2

accessKeyId = "xxx"
accessKeySecret = "xxx"

endpoint = "oss-cn-shanghai-internal.aliyuncs.com"
# endpoint = "oss-cn-shanghai.aliyuncs.com"

bucket = "xxx"
localDirectory = "/data/mysql"
prefix = "db_bak/mysql"

auth = oss2.Auth(accessKeyId, accessKeySecret)
bucket = oss2.Bucket(auth, endpoint, bucket)

# 当文件长度大于或等于可选参数multipart_threshold（默认值为10MB）时，会使用分片上传。如未使用参数store指定目录，则会在HOME目录下建立.py-oss-upload目录来保存断点信息。
# oss2.resumable_upload(bucket, '<yourObjectName>', '<yourLocalFile>')

# 遍历目录进行上传
for fpathe, dirs, fs in os.walk(localDirectory):
    for f in fs:
        localFileName = os.path.join(fpathe, f)
        newObjectName = localFileName[len(localDirectory) + 1:]
        newObjectName = prefix + '/' + newObjectName
        # 跳过已存在的文件
        if bucket.object_exists(newObjectName):
            print('pass ' + newObjectName)
            continue
        # SDK自己分片大文件似乎有bug，用php版吧
        oss2.resumable_upload(bucket, newObjectName, localFileName)
        print(newObjectName)
        print(localFileName)

然后是php版(上传300G的大文件没问题)

<?php
use OSS\Core\OssException;
use OSS\Core\OssUtil;
use OSS\OssClient;

require 'vendor/autoload.php';

$accessKeyId = "xxx";
$accessKeySecret = "xxx";

$endpoint = "oss-cn-shanghai-internal.aliyuncs.com";
//$endpoint = "oss-cn-shanghai.aliyuncs.com";
$bucket = "xxx";
$localDirectory = "/data/mysql";
$prefix = "db/data";

function iScanDir($path = '.')
{
    $dirs = scandir($path);
    foreach ($dirs as $filename) {
        if ($filename == '.' || $filename == '..') {
            continue;
        }
        $fullFileName = "{$path}/{$filename}";
        if (is_dir($fullFileName)) {
            foreach (iScanDir($fullFileName) as $subFileName) {
                yield $subFileName;
            }
        } else {
            yield "{$fullFileName}";
        }
    }
}

try {
    $ossClient = new OssClient($accessKeyId, $accessKeySecret, $endpoint);
} catch (OssException $e) {
    exit($e->getMessage() . "\n");
}
$ossClient->setMaxTries(16);

foreach (iScanDir($localDirectory) as $fileName) {
    $object = substr($fileName, strlen($localDirectory));
    $object = trim($object, '.');
    $object = trim($object, '/');
    $object = "{$prefix}/{$object}";

    $uploadFile = $fileName;
    echo "{$fileName} ";

    $exist = $ossClient->doesObjectExist($bucket, $object);
    if ($exist) {
        print(" : exist\n");
        continue;
    }

try {
        $uploadId = $ossClient->initiateMultipartUpload($bucket, $object);
    } catch (OssException $e) {
        echo "initiateMultipartUpload error: " . $e->getMessage() . "\n";
    }

    $partSize = 10 * 1024 * 1024;
    $uploadFileSize = filesize($uploadFile);
    while (true) {
        if ($partSize * 9999 < $uploadFileSize) {
            $partSize = $partSize + 10 * 1024 * 1024;
        } else {
            break;
        }
    }
    $pieces = $ossClient->generateMultiuploadParts($uploadFileSize, $partSize);
    $responseUploadPart = [];
    $uploadPosition = 0;
    $isCheckMd5 = true;
    foreach ($pieces as $i => $piece) {
        $fromPos = $uploadPosition + (integer)$piece[$ossClient::OSS_SEEK_TO];
        $toPos = (integer)$piece[$ossClient::OSS_LENGTH] + $fromPos - 1;
        $upOptions = [
            $ossClient::OSS_FILE_UPLOAD => $uploadFile,
            $ossClient::OSS_PART_NUM => ($i + 1),
            $ossClient::OSS_SEEK_TO => $fromPos,
            $ossClient::OSS_LENGTH => $toPos - $fromPos + 1,
            $ossClient::OSS_CHECK_MD5 => $isCheckMd5,
        ];
        // MD5校验。
if ($isCheckMd5) {
            $contentMd5 = OssUtil::getMd5SumForFile($uploadFile, $fromPos, $toPos);
            $upOptions[$ossClient::OSS_CONTENT_MD5] = $contentMd5;
        }
        try {
            // 上传分片。
$responseUploadPart[] = $ossClient->uploadPart($bucket, $object, $uploadId, $upOptions);
        } catch (OssException $e) {
            printf(__FUNCTION__ . ": initiateMultipartUpload, uploadPart - part#{$i} FAILED\n");
            printf($e->getMessage() . "\n");
            return;
        }
        printf(__FUNCTION__ . ": initiateMultipartUpload, uploadPart - part#{$i} OK\n");
    }
    // $uploadParts是由每个分片的ETag和分片号（PartNumber）组成的数组。
$uploadParts = [];
    foreach ($responseUploadPart as $i => $eTag) {
        $uploadParts[] = [
            'PartNumber' => ($i + 1),
            'ETag' => $eTag,
        ];
    }
    /**
     * 步骤3：完成上传。
*/
try {
        // 在执行该操作时，需要提供所有有效的$uploadParts。OSS收到提交的$uploadParts后，会逐一验证每个分片的有效性。当所有的数据分片验证通过后，OSS将把这些分片组合成一个完整的文件。
$ossClient->completeMultipartUpload($bucket, $object, $uploadId, $uploadParts);
    } catch (OssException $e) {
        printf(__FUNCTION__ . ": completeMultipartUpload FAILED\n");
        printf($e->getMessage() . "\n");
        return;
    }
    printf(__FUNCTION__ . ": completeMultipartUpload OK\n");
}