Impala2.7.0-cdh5.x.x安装部署
部署impala
impala安装选择rpm包方式进行,这是本次部署唯一一个主要主件采用rpm方式进行安装部署,这里主要原因是cloudera没有提供现成的tar包文件,而源码编译过程会出现各种未知原因,为了方便采用以下方式进行部署。
安装介质如下:
$ ls
bigtop-utils-0.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.noarch.rpm
impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm
impala-shell-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm
impala-catalog-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm
impala-state-store-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm
impala-debuginfo-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm
impala-udf-devel-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm
impala-server-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm
sentry-1.5.1+cdh5.10.0+272-1.cdh5.10.0.p0.70.el7.noarch.rpm
[hadoop@db01 impala270]$ rpm -ivh impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm
warning: impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID e8f86acd: NOKEY
error: Failed dependencies:
bigtop-utils >= 0.7 is needed by impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64
hadoop is needed by impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64
hadoop-hdfs is needed by impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64
hadoop-yarn is needed by impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64
hadoop-mapreduce is needed by impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64
hbase is needed by impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64
hive >= 0.12.0+cdh5.1.0 is needed by impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64
zookeeper is needed by impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64
hadoop-libhdfs is needed by impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64
avro-libs is needed by impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64
parquet is needed by impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64
sentry >= 1.3.0+cdh5.1.0 is needed by impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64
sentry is needed by impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64
/lib/lsb/init-functions is needed by impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64
libhdfs.so.0.0.0()(64bit) is needed by impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64
[hadoop@db01 impala270]$
1、安装bigtop和sentry
$sudo yum -y install redhat-lsb
sudo rpm -ivh bigtop-utils-0.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.noarch.rpm
warning: bigtop-utils-0.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.noarch.rpm: Header V4 DSA/SHA1 Signature, key ID e8f86acd: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:bigtop-utils-0.7.0+cdh5.10.0+0-1.################################# [100%]
$sudo rpm -ivh sentry-1.5.1+cdh5.10.0+272-1.cdh5.10.0.p0.70.el7.noarch.rpm --nodeps
warning: sentry-1.5.1+cdh5.10.0+272-1.cdh5.10.0.p0.70.el7.noarch.rpm: Header V4 DSA/SHA1 Signature, key ID e8f86acd: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:sentry-1.5.1+cdh5.10.0+272-1.cdh5################################# [100%]
2、impalad安装
注:impalad需安装在所有datanode服务器上。
sudo rpm -ivh impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm --nodeps
warning: impala-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID e8f86acd: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:impala-2.7.0+cdh5.10.0+0-1.cdh5.1################################# [100%]
3、安装impala server
sudo rpm -ivh impala-server-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm
warning: impala-server-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID e8f86acd: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:impala-server-2.7.0+cdh5.10.0+0-1################################# [100%]
--以上步骤在所有datanode节点安装
4、修改配置文件
sudo vim /etc/default/impala
IMPALA_CATALOG_SERVICE_HOST=db01
IMPALA_STATE_STORE_HOST=db01
这两个ip是要装CATALOG和STATE_STORE的节点,
CATALOG和STATE_STORE这两个服务必须和hive装在同一个节点
在一个节点编辑后,复制到其他节点
sudo scp /etc/default/impala db02:/etc/default/impala
sudo scp /etc/default/impala db03:/etc/default/impala
sudo scp /etc/default/impala db04:/etc/default/impala
vim /etc/default/bigtop-utils
export JAVA_HOME=/opt/service/jdk1.7.0_67
scp bigtop-utils db02:/etc/default/bigtop-utils
scp bigtop-utils db03:/etc/default/bigtop-utils
scp bigtop-utils db04:/etc/default/bigtop-utils
vim hdfs-site.xml
<property>
<name>dfs.datanode.hdfs-blocks-metadata.enabled</name>
<value>true</value>
</property>
<property>
<name>dfs.client.file-block-storage-locations.timeout.millis</name>
<value>10000</value>
</property>
5、复制hive和hadoop的配置文件到impala
sudo scp /opt/cdh5/hive-1.1.0-cdh5.10.0/conf/hive-site.xml db01:/etc/impala/conf/
sudo scp /opt/cdh5/hive-1.1.0-cdh5.10.0/conf/hive-site.xml db02:/etc/impala/conf/
sudo scp /opt/cdh5/hive-1.1.0-cdh5.10.0/conf/hive-site.xml db03:/etc/impala/conf/
sudo scp /opt/cdh5/hive-1.1.0-cdh5.10.0/conf/hive-site.xml db04:/etc/impala/conf/
sudo scp /opt/cdh5/hadoop-2.6.0-cdh5.10.0/etc/hadoop/core-site.xml db01:/etc/impala/conf/
sudo scp /opt/cdh5/hadoop-2.6.0-cdh5.10.0/etc/hadoop/core-site.xml db02:/etc/impala/conf/
sudo scp /opt/cdh5/hadoop-2.6.0-cdh5.10.0/etc/hadoop/core-site.xml db03:/etc/impala/conf/
sudo scp /opt/cdh5/hadoop-2.6.0-cdh5.10.0/etc/hadoop/core-site.xml db04:/etc/impala/conf/
sudo scp /opt/cdh5/hadoop-2.6.0-cdh5.10.0/etc/hadoop/hdfs-site.xml db01:/etc/impala/conf/
sudo scp /opt/cdh5/hadoop-2.6.0-cdh5.10.0/etc/hadoop/hdfs-site.xml db02:/etc/impala/conf/
sudo scp /opt/cdh5/hadoop-2.6.0-cdh5.10.0/etc/hadoop/hdfs-site.xml db03:/etc/impala/conf/
sudo scp /opt/cdh5/hadoop-2.6.0-cdh5.10.0/etc/hadoop/hdfs-site.xml db04:/etc/impala/conf/
6、在hive节点安装impala-state-store 和impala-catalog
$ sudo rpm -ivh impala-state-store-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm
warning: impala-state-store-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID e8f86acd: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:impala-state-store-2.7.0+cdh5.10.################################# [100%]
$ sudo rpm -ivh impala-catalog-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm
warning: impala-catalog-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID e8f86acd: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:impala-catalog-2.7.0+cdh5.10.0+0-################################# [100%]
$ sudo cp /mnt/mysql-connector-java-5.1.22-bin.jar /var/lib/impala/
7、所有节点安装impala shell
sudo yum -y install python-setuptools
sudo rpm -ivh impala-shell-2.7.0+cdh5.10.0+0-1.cdh5.10.0.p0.71.el7.x86_64.rpm
8、修改impala依赖jar包,通过软连接方式
sudo rm -rf /usr/lib/impala/lib/hadoop-annotations.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-auth.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-aws.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-common.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-hdfs.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-mapreduce-client-common.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-mapreduce-client-core.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-mapreduce-client-jobclient.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-mapreduce-client-shuffle.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-yarn-api.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-yarn-client.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-yarn-common.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-yarn-server-applicationhistoryservice.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-yarn-server-common.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-yarn-server-nodemanager.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-yarn-server-resourcemanager.jar
sudo rm -rf /usr/lib/impala/lib/hadoop-yarn-server-web-proxy.jar
sudo rm -rf /usr/lib/impala/lib/hbase-annotations.jar
sudo rm -rf /usr/lib/impala/lib/hbase-client.jar
sudo rm -rf /usr/lib/impala/lib/hbase-common.jar
sudo rm -rf /usr/lib/impala/lib/hbase-protocol.jar
sudo rm -rf /usr/lib/impala/lib/hive-ant.jar
sudo rm -rf /usr/lib/impala/lib/hive-beeline.jar
sudo rm -rf /usr/lib/impala/lib/hive-common.jar
sudo rm -rf /usr/lib/impala/lib/hive-exec.jar
sudo rm -rf /usr/lib/impala/lib/hive-hbase-handler.jar
sudo rm -rf /usr/lib/impala/lib/hive-metastore.jar
sudo rm -rf /usr/lib/impala/lib/hive-serde.jar
sudo rm -rf /usr/lib/impala/lib/hive-service.jar
sudo rm -rf /usr/lib/impala/lib/hive-shims-common.jar
sudo rm -rf /usr/lib/impala/lib/hive-shims.jar
sudo rm -rf /usr/lib/impala/lib/hive-shims-scheduler.jar
sudo rm -rf /usr/lib/impala/lib/zookeeper.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/common/lib/hadoop-annotations-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-annotations.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/common/lib/hadoop-auth-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-auth.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/mapreduce1/lib/hadoop-aws-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-aws.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/common/hadoop-common-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-common.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/hdfs/hadoop-hdfs-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-hdfs.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/mapreduce/hadoop-mapreduce-client-common-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-mapreduce-client-common.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/mapreduce/hadoop-mapreduce-client-core-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-mapreduce-client-core.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-mapreduce-client-jobclient.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/mapreduce/hadoop-mapreduce-client-shuffle-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-mapreduce-client-shuffle.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/yarn/hadoop-yarn-api-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-yarn-api.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/yarn/hadoop-yarn-client-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-yarn-client.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/yarn/hadoop-yarn-common-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-yarn-common.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/yarn/hadoop-yarn-server-applicationhistoryservice-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-yarn-server-applicationhistoryservice.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/yarn/hadoop-yarn-server-common-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-yarn-server-common.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/yarn/hadoop-yarn-server-nodemanager-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-yarn-server-nodemanager.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/yarn/hadoop-yarn-server-resourcemanager-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-yarn-server-resourcemanager.jar
sudo ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/share/hadoop/yarn/hadoop-yarn-server-web-proxy-2.6.0-cdh5.10.0.jar /usr/lib/impala/lib/hadoop-yarn-server-web-proxy.jar
sudo ln -s /opt/cdh5/hbase-1.2.0-cdh5.10.0/lib/hbase-annotations-1.2.0-cdh5.10.0.jar /usr/lib/impala/lib/hbase-annotations.jar
sudo ln -s /opt/cdh5/hbase-1.2.0-cdh5.10.0/lib/hbase-client-1.2.0-cdh5.10.0.jar /usr/lib/impala/lib/hbase-client.jar
sudo ln -s /opt/cdh5/hbase-1.2.0-cdh5.10.0/lib/hbase-common-1.2.0-cdh5.10.0.jar /usr/lib/impala/lib/hbase-common.jar
sudo ln -s /opt/cdh5/hbase-1.2.0-cdh5.10.0/lib/hbase-protocol-1.2.0-cdh5.10.0.jar /usr/lib/impala/lib/hbase-protocol.jar
sudo ln -s /opt/cdh5/hive-1.1.0-cdh5.10.0/lib/hive-ant-1.1.0-cdh5.10.0.jar /usr/lib/impala/lib/hive-ant.jar
sudo ln -s /opt/cdh5/hive-1.1.0-cdh5.10.0/lib/hive-beeline-1.1.0-cdh5.10.0.jar /usr/lib/impala/lib/hive-beeline.jar
sudo ln -s /opt/cdh5/hive-1.1.0-cdh5.10.0/lib/hive-common-1.1.0-cdh5.10.0.jar /usr/lib/impala/lib/hive-common.jar
sudo ln -s /opt/cdh5/hive-1.1.0-cdh5.10.0/lib/hive-exec-1.1.0-cdh5.10.0.jar /usr/lib/impala/lib/hive-exec.jar
sudo ln -s /opt/cdh5/hive-1.1.0-cdh5.10.0/lib/hive-hbase-handler-1.1.0-cdh5.10.0.jar /usr/lib/impala/lib/hive-hbase-handler.jar
sudo ln -s /opt/cdh5/hive-1.1.0-cdh5.10.0/lib/hive-metastore-1.1.0-cdh5.10.0.jar /usr/lib/impala/lib/hive-metastore.jar
sudo ln -s /opt/cdh5/hive-1.1.0-cdh5.10.0/lib/hive-serde-1.1.0-cdh5.10.0.jar /usr/lib/impala/lib/hive-serde.jar
sudo ln -s /opt/cdh5/hive-1.1.0-cdh5.10.0/lib/hive-service-1.1.0-cdh5.10.0.jar /usr/lib/impala/lib/hive-service.jar
sudo ln -s /opt/cdh5/hive-1.1.0-cdh5.10.0/lib/hive-shims-common-1.1.0-cdh5.10.0.jar /usr/lib/impala/lib/hive-shims-common.jar
sudo ln -s /opt/cdh5/hive-1.1.0-cdh5.10.0/lib/hive-shims-1.1.0-cdh5.10.0.jar /usr/lib/impala/lib/hive-shims.jar
sudo ln -s /opt/cdh5/hive-1.1.0-cdh5.10.0/lib/hive-shims-scheduler-1.1.0-cdh5.10.0.jar /usr/lib/impala/lib/hive-shims-scheduler.jar
sudo ln -s /opt/cdh5/zookeeper-3.4.5-cdh5.10.0/zookeeper-3.4.5-cdh5.10.0.jar /usr/lib/impala/lib/zookeeper.jar
rm -rf /usr/lib/impala/lib/libhadoop.so
rm -rf /usr/lib/impala/lib/libhadoop.so.1.0.0
rm -rf /usr/lib/impala/lib/libhdfs.so
rm -rf /usr/lib/impala/lib/libhdfs.so.0.0.0
ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/lib/native/libhadoop.so /usr/lib/impala/lib/libhadoop.so
ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/lib/native/libhadoop.so.1.0.0 /usr/lib/impala/lib/libhadoop.so.1.0.0
ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/lib/native/libhdfs.so /usr/lib/impala/lib/libhdfs.so
ln -s /opt/cdh5/hadoop-2.6.0-cdh5.10.0/lib/native/libhdfs.so.0.0.0 /usr/lib/impala/lib/libhdfs.so.0.0.0
9、启动impala
#安装了hive的节点启动state-store和catalog服务
service impala-state-store start
service impala-catalog start
#所有datanode节点启动impalad
service impala-server start
Impala2.7.0-cdh5.x.x安装部署的更多相关文章
- Linux平台Oracle 12.1.0.2 单实例安装部署
主题:Linux平台Oracle 12.1.0.2 单实例安装部署 环境:RHEL 6.5 + Oracle 12.1.0.2 需求:安装部署OEM 13.2需要Oracle 12.1.0.2版本作为 ...
- redis4.0.1集群安装部署
安装环境 序号 项目 值 1 OS版本 Red Hat Enterprise Linux Server release 7.1 (Maipo) 2 内核版本 3.10.0-229.el7.x86_64 ...
- 0、ubuntu16.04安装部署kvm
ubuntu16.04安装部署kvm1.查看CPU是否支持KVM egrep "(svm|vmx)" /proc/cpuinfo 2.安装相关kvm包 sudo apt-get i ...
- window10下的solr6.1.0入门笔记之---安装部署
1.安装部署java1.6+ ,确保jre安装[安装步骤略] 安装后的环境为jdk1.8+ jre1.8+ 2.安装ant 下载:官网=>http://ant.apache.org/=> ...
- centos7 ambari2.6.1.5+hdp2.6.4.0 大数据集群安装部署
前言 本文是讲如何在centos7(64位) 安装ambari+hdp,如果在装有原生hadoop等集群的机器上安装,需要先将集群服务停掉,然后将不需要的环境变量注释掉即可,如果不注释掉,后面虽然可以 ...
- CDH5.12.1 安装部署
###通过http://192.168.50.200:7180/cmf/login 访问CM控制台 4.CDH安装 4.1CDH集群安装向导 1.admin/admin登陆到CM 2.同意licens ...
- Storm-0.9.0.1安装部署 指导
可以带着下面问题来阅读本文章: 1.Storm只支持什么传输 2.通过什么配置,可以更改Zookeeper默认端口 3.Storm UI必须和Storm Nimbus部署在同一台机器上,UI无法正常工 ...
- OEMCC 13.2 安装部署
需求:安装部署OEM 13.2 环境:两台主机,系统RHEL 6.5,分别部署OMS和OMR: OMS,也就是OEMCC的服务端 IP:192.168.1.88 内存:12G+ 硬盘:100G+ OM ...
- Apache atlas liunx环境安装部署手册
一. 背景 本文使用一台ubuntu虚拟机安装Apache-atlas,使用集成包unzip apache-atlas-2.1.0.zip进行快速安装部署,该集成包高度集成了hadoop ...
随机推荐
- MySQL的reset slave与reset slave all
reset slave是各版本Mysql都有的功能,可以让slave忘记自己在master binary log中的复制位置. reset slave命令主要完成以下工作内容: -删除master.i ...
- java中使用队列:java.util.Queue(转)
队列是一种特殊的线性表,是运算受到限制的一种线性表,只允许在表的一端进行插入,而在另一端进行删除元素的线性表.队尾(rear)是允许插入的一端.队头(front)是允许删除的一端.空队列是不含元素的空 ...
- 使用DIV弹出框的代码示例,备忘。
1.思路 使用DIV模拟弹出框,一共用三个div: divWindow: 原来的界面内容区域 divLogin:要弹出的内容区域 divBackground:给弹出内容区域做个遮罩的区域. 点击 “请 ...
- Zabbix-2.X/3.X监控工具监控Redis以及zabbix Redis监控模板下载
为了监控Redis3的运行状况,去zabbix官网查找资料,根据提示,找到了这个项目:https://github.com/blacked/zbx_redis_template 但是文档和内容已经不匹 ...
- Source Insight 常用设置
1.背景色选择 要改变背景色Options->preference->windows background->color设置背景色2.解决字符等宽对齐问题 SIS默认字体是VE ...
- 8个非常个性化的CSS3单/复选框
单选框和复选框在网页表单中应用十分广泛,但是浏览器默认自带的单选框和复选框样式不仅不统一,而且大多都比较简单丑陋.本文给大家介绍了一些基于CSS3的个性化单选框和复选框,一些选中动画是基于jQuery ...
- Java设计模式六大原则
一.单一职责原则 单一职责原则是最简单的面向对象设计原则,它用于控制类的粒度大小.单一职责原则定义如下: 单一职责原则(Single Responsibility Principle, SRP):一个 ...
- Java知多少(5) Java开发环境的搭建
要进行Java开发,首先要安装JDK(Java Development Kit,Java开发工具箱). JDK 是一系列工具的集合,这些工具是编译Java源码.运行Java程序所必需的,例如JVM.基 ...
- 第三百九十五节,Django+Xadmin打造上线标准的在线教育平台—Xadmin集成富文本框
第三百九十五节,Django+Xadmin打造上线标准的在线教育平台—Xadmin集成富文本框 首先安装DjangoUeditor3模块 Ueditor HTML编辑器是百度开源的HTML编辑器 下载 ...
- Linux系统排查4——网络篇
用于排查Linux系统的网络故障. 网络排查一般是有一定的思路和顺序的,其实排查的思路就是根据具体的问题逐段排除故障可能发生的地方,最终确定问题. 所以首先要问一问,网络问题是什么,是不通,还是慢? ...