技术标签: cygwin webrtc 音视频 coturn windows
coTurn是一个开源的STUN和TURN及ICE服务项目,只是不支持Windows。
为了在window平台上使用coTurn源码,需要在windows平台下安装Cygwin环境,并编译coTurn源码,使其可以运行在windows平台上。
步骤:
1、安装Cygwin,地址:https://cygwin.com/install.html,按照其说明进行安装。参照说明地址:https://cygwin.com/cygwin-ug-net/cygwin-ug-net.html
最好选择64位的,我一开始用的32位的,安装gcc总是报错,换到64位就可以了(也许是我机子问题)。
安装过程中选择的镜像源地址,为了更加快速,使用http://mirrors.163.com/cygwin/
这里有几个坑,要注意,不然编译的时候 会报错:
在这个页面,要在del列表下选择四个工具库:
①gcc
②openssl
③libevent
④make(bin和source都要选择)
2、下载coTurn源码。目前Release最新版本的地址为:https://codeload.github.com/coturn/coturn/zip/4.5.0.4
解压后,把coturn-4.5.0.4文件夹放在cygwin的安装路劲C:\cygwin64\bin下。后面就开始编译了。
3、编译:
编译过程:
$ ./configure
install 是 /usr/bin/install
sqlite3 是 /cygdrive/c/Users/Administrator/AppData/Local/Android/Sdk/platform-tools/sqlite3
Use TMP dir /var/tmp
Compiler: cc
Library option -lsocket cannot be used
CYGWIN ?
Library option -lwldap64 cannot be used
Library option -lintl cannot be used
Library option -lnsl cannot be used
Sockets code is fine: no sin_len field present
Ignore IP_RECVERR
Crypto SSL lib found.
SSL lib found.
Libevent2 development found.
Libevent2 runtime found.
Libevent2 runtime 'extra' found.
Libevent2 openssl found.
Libevent2 pthreads found.
Library option -lsqlite3 cannot be used
SQLite3 development library cannot be found.
SQLite DEVELOPMENT LIBRARY (libsqlite3) AND/OR HEADER (sqlite3.h)
ARE NOT INSTALLED PROPERLY ON THIS SYSTEM.
THAT'S OK BUT THE TURN SERVER IS BUILDING WITHOUT SQLITE SUPPORT.
POSTGRESQL DEVELOPMENT LIBRARY (libpq.a) AND/OR HEADER (libpq-fe.h)
ARE NOT INSTALLED PROPERLY ON THIS SYSTEM.
THAT'S OK BUT THE TURN SERVER IS BUILDING WITHOUT POSTGRESQL DATABASE SUPPORT.
MYSQL DEVELOPMENT LIBRARY (libmysqlclient) AND/OR HEADER (mysql.h)
ARE NOT INSTALLED PROPERLY ON THIS SYSTEM.
THAT'S OK BUT THE TURN SERVER IS BUILDING WITHOUT MYSQL DATABASE SUPPORT.
MONGODB DEVELOPMENT LIBRARIES (libmongoc-1.0 and libbson-1.0) AND/OR HEADER (mongoc.h)
ARE NOT INSTALLED PROPERLY ON THIS SYSTEM.
THAT'S OK BUT THE TURN SERVER IS BUILDING WITHOUT MONGODB SUPPORT.
HIREDIS DEVELOPMENT LIBRARY (libhiredis.*) AND/OR HEADERS (hiredis/*.h)
ARE NOT INSTALLED PROPERLY ON THIS SYSTEM.
THAT'S OK BUT THE TURN SERVER IS BUILDING WITHOUT REDIS SUPPORT.
PREFIX=/usr/local LOCALSTATEDIR=/usr/local/var OSLIBS= -L/usr/local/lib/ -L/usr/local/lib/ -lrt -lwldap32 -lresolv -lcrypto -lssl -levent_core -levent_extra -levent_openssl -levent_pthreads -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib DBLIBS= OSCFLAGS=-g -Wall -Wno-deprecated-declarations -Wextra -Wformat-security -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -I/usr/local/include -I/usr/local/include/ -I/usr/local/include -DTURN_HAS_DAEMON -DINSTALL_PREFIX=/usr/local -DTURNDB=/usr/local/var/db/turndb DBCFLAGS=
Makefile created: success.
$ make
mkdir -p build/obj
cc -g -Wall -Wno-deprecated-declarations -Wextra -Wformat-security -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -I/usr/local/include -I/usr/local/include/ -I/usr/local/include -DTURN_HAS_DAEMON -DINSTALL_PREFIX=/usr/local -DTURNDB=/usr/local/var/db/turndb -Isrc -Isrc/apps/common -Isrc/server -Isrc/client -Isrc/client++ -I/usr/local/include/ -I/usr/local/include/ -c src/client/ns_turn_ioaddr.c -o build/obj/ns_turn_ioaddr.o
mkdir -p build/obj
cc -g -Wall -Wno-deprecated-declarations -Wextra -Wformat-security -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -I/usr/local/include -I/usr/local/include/ -I/usr/local/include -DTURN_HAS_DAEMON -DINSTALL_PREFIX=/usr/local -DTURNDB=/usr/local/var/db/turndb -Isrc -Isrc/apps/common -Isrc/server -Isrc/client -Isrc/client++ -I/usr/local/include/ -I/usr/local/include/ -c src/client/ns_turn_msg_addr.c -o build/obj/ns_turn_msg_addr.o
mkdir -p build/obj
cc -g -Wall -Wno-deprecated-declarations -Wextra -Wformat-security -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -I/usr/local/include -I/usr/local/include/ -I/usr/local/include -DTURN_HAS_DAEMON -DINSTALL_PREFIX=/usr/local -DTURNDB=/usr/local/var/db/turndb -Isrc -Isrc/apps/common -Isrc/server -Isrc/client -Isrc/client++ -I/usr/local/include/ -I/usr/local/include/ -c src/client/ns_turn_msg.c -o build/obj/ns_turn_msg.o
mkdir -p lib
ar -r lib/libturnclient.a build/obj/ns_turn_ioaddr.o build/obj/ns_turn_msg_addr.o build/obj/ns_turn_msg.o
ar: 正在创建 lib/libturnclient.a
pwd
/cygdrive/e/workspace/webrtc/coturn-master
mkdir -p bin
cc -g -Wall -Wno-deprecated-declarations -Wextra -Wformat-security -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -I/usr/local/include -I/usr/local/include/ -I/usr/local/include -DTURN_HAS_DAEMON -DINSTALL_PREFIX=/usr/local -DTURNDB=/usr/local/var/db/turndb -Isrc -Isrc/apps/common -Isrc/server -Isrc/client -Isrc/client++ -I/usr/local/include/ -I/usr/local/include/ src/apps/oauth/oauth.c src/apps/common/apputils.c src/apps/common/ns_turn_utils.c src/apps/common/stun_buffer.c -o bin/turnutils_oauth -Llib -lturnclient -Llib -L/usr/local/lib/ -L/usr/local/lib/ -lrt -lwldap32 -lresolv -lcrypto -lssl -levent_core -levent_extra -levent_openssl -levent_pthreads -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib
pwd
/cygdrive/e/workspace/webrtc/coturn-master
mkdir -p bin
cc -g -Wall -Wno-deprecated-declarations -Wextra -Wformat-security -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -I/usr/local/include -I/usr/local/include/ -I/usr/local/include -DTURN_HAS_DAEMON -DINSTALL_PREFIX=/usr/local -DTURNDB=/usr/local/var/db/turndb -Isrc -Isrc/apps/common -Isrc/server -Isrc/client -Isrc/client++ -I/usr/local/include/ -I/usr/local/include/ src/apps/natdiscovery/natdiscovery.c src/apps/common/apputils.c src/apps/common/ns_turn_utils.c src/apps/common/stun_buffer.c -o bin/turnutils_natdiscovery -Llib -lturnclient -Llib -L/usr/local/lib/ -L/usr/local/lib/ -lrt -lwldap32 -lresolv -lcrypto -lssl -levent_core -levent_extra -levent_openssl -levent_pthreads -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib
pwd
/cygdrive/e/workspace/webrtc/coturn-master
mkdir -p bin
cc -g -Wall -Wno-deprecated-declarations -Wextra -Wformat-security -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -I/usr/local/include -I/usr/local/include/ -I/usr/local/include -DTURN_HAS_DAEMON -DINSTALL_PREFIX=/usr/local -DTURNDB=/usr/local/var/db/turndb -Isrc -Isrc/apps/common -Isrc/server -Isrc/client -Isrc/client++ -I/usr/local/include/ -I/usr/local/include/ src/apps/stunclient/stunclient.c src/apps/common/apputils.c src/apps/common/ns_turn_utils.c src/apps/common/stun_buffer.c -o bin/turnutils_stunclient -Llib -lturnclient -Llib -L/usr/local/lib/ -L/usr/local/lib/ -lrt -lwldap32 -lresolv -lcrypto -lssl -levent_core -levent_extra -levent_openssl -levent_pthreads -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib
pwd
/cygdrive/e/workspace/webrtc/coturn-master
mkdir -p bin
cc -g -Wall -Wno-deprecated-declarations -Wextra -Wformat-security -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -I/usr/local/include -I/usr/local/include/ -I/usr/local/include -DTURN_HAS_DAEMON -DINSTALL_PREFIX=/usr/local -DTURNDB=/usr/local/var/db/turndb -Isrc -Isrc/apps/common -Isrc/server -Isrc/client -Isrc/client++ -I/usr/local/include/ -I/usr/local/include/ src/apps/rfc5769/rfc5769check.c src/apps/common/apputils.c src/apps/common/ns_turn_utils.c src/apps/common/stun_buffer.c -o bin/turnutils_rfc5769check -Llib -lturnclient -Llib -L/usr/local/lib/ -L/usr/local/lib/ -lrt -lwldap32 -lresolv -lcrypto -lssl -levent_core -levent_extra -levent_openssl -levent_pthreads -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib
mkdir -p bin
cc -g -Wall -Wno-deprecated-declarations -Wextra -Wformat-security -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -I/usr/local/include -I/usr/local/include/ -I/usr/local/include -DTURN_HAS_DAEMON -DINSTALL_PREFIX=/usr/local -DTURNDB=/usr/local/var/db/turndb -Isrc -Isrc/apps/common -Isrc/server -Isrc/client -Isrc/client++ -I/usr/local/include/ -I/usr/local/include/ src/apps/uclient/uclient.c src/apps/uclient/startuclient.c src/apps/uclient/mainuclient.c src/apps/common/apputils.c src/apps/common/ns_turn_utils.c src/apps/common/stun_buffer.c -o bin/turnutils_uclient -Llib -lturnclient -Llib -L/usr/local/lib/ -L/usr/local/lib/ -lrt -lwldap32 -lresolv -lcrypto -lssl -levent_core -levent_extra -levent_openssl -levent_pthreads -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib
mkdir -p bin
rm -rf bin/turnadmin
cc -g -Wall -Wno-deprecated-declarations -Wextra -Wformat-security -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -I/usr/local/include -I/usr/local/include/ -I/usr/local/include -DTURN_HAS_DAEMON -DINSTALL_PREFIX=/usr/local -DTURNDB=/usr/local/var/db/turndb -Isrc -Isrc/apps/common -Isrc/server -Isrc/client -Isrc/client++ -I/usr/local/include/ -I/usr/local/include/ -DTURN_NO_PQ -DTURN_NO_MYSQL -DTURN_NO_SQLITE -DTURN_NO_MONGO -DTURN_NO_HIREDIS src/apps/relay/ns_ioalib_engine_impl.c src/apps/relay/turn_ports.c src/apps/relay/http_server.c -Ilib src/apps/relay/mainrelay.c src/apps/relay/netengine.c src/apps/relay/libtelnet.c src/apps/relay/turn_admin_server.c src/apps/relay/userdb.c src/apps/relay/tls_listener.c src/apps/relay/dtls_listener.c src/apps/common/hiredis_libevent2.c src/apps/relay/dbdrivers/dbdriver.c src/apps/relay/dbdrivers/dbd_sqlite.c src/apps/relay/dbdrivers/dbd_pgsql.c src/apps/relay/dbdrivers/dbd_mysql.c src/apps/relay/dbdrivers/dbd_mongo.c src/apps/relay/dbdrivers/dbd_redis.c src/apps/common/apputils.c src/apps/common/ns_turn_utils.c src/apps/common/stun_buffer.c src/client/ns_turn_ioaddr.c src/client/ns_turn_msg_addr.c src/client/ns_turn_msg.c src/server/ns_turn_allocation.c src/server/ns_turn_maps_rtcp.c src/server/ns_turn_maps.c src/server/ns_turn_server.c -o bin/turnserver -L/usr/local/lib/ -L/usr/local/lib/ -lrt -lwldap32 -lresolv -lcrypto -lssl -levent_core -levent_extra -levent_openssl -levent_pthreads -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib
cd bin; ln -s turnserver turnadmin
mkdir -p bin
cc -g -Wall -Wno-deprecated-declarations -Wextra -Wformat-security -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wcast-qual -I/usr/local/include -I/usr/local/include/ -I/usr/local/include -DTURN_HAS_DAEMON -DINSTALL_PREFIX=/usr/local -DTURNDB=/usr/local/var/db/turndb -Isrc -Isrc/apps/common -Isrc/server -Isrc/client -Isrc/client++ -I/usr/local/include/ -I/usr/local/include/ src/apps/peer/mainudpserver.c src/apps/peer/udpserver.c src/apps/common/apputils.c src/apps/common/ns_turn_utils.c src/apps/common/stun_buffer.c -o bin/turnutils_peer -Llib -lturnclient -Llib -L/usr/local/lib/ -L/usr/local/lib/ -lrt -lwldap32 -lresolv -lcrypto -lssl -levent_core -levent_extra -levent_openssl -levent_pthreads -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib/ -Wl,-rpath,/usr/local/lib
rm -rf include
mkdir -p include/turn/client
cp -pf src/client/*.h include/turn/client/
cp -pf src/client++/*.h include/turn/client/
cp -pf src/ns_turn_defs.h include/turn/
install -d sqlite
rm -rf sqlite/turndb
sqlite3 sqlite/turndb < turndb/schema.sql
$ make install
install -d /usr/local
install -d /usr/local/bin
install -d /usr/local/var/db
install -d /usr/local/man/man1
install -d /usr/local/etc
install -d /usr/local/lib
install -d /usr/local/share/examples/turnserver
install -d /usr/local/share/doc/turnserver
install -d /usr/local/share/turnserver
install -d /usr/local/include/turn
install bin/turnserver /usr/local/bin
install bin/turnadmin /usr/local/bin
install bin/turnutils_uclient /usr/local/bin
install bin/turnutils_peer /usr/local/bin
install bin/turnutils_stunclient /usr/local/bin
install bin/turnutils_oauth /usr/local/bin
install bin/turnutils_natdiscovery /usr/local/bin
install man/man1/turnserver.1 /usr/local/man/man1/
install man/man1/turnadmin.1 /usr/local/man/man1/
install man/man1/turnutils.1 /usr/local/man/man1/
install man/man1/turnutils_uclient.1 /usr/local/man/man1/
install man/man1/turnutils_stunclient.1 /usr/local/man/man1/
install man/man1/turnutils_oauth.1 /usr/local/man/man1/
install man/man1/turnutils_natdiscovery.1 /usr/local/man/man1/
install man/man1/turnutils_peer.1 /usr/local/man/man1/
install man/man1/coturn.1 /usr/local/man/man1/
install lib/libturnclient.a /usr/local/lib
install LICENSE /usr/local/share/doc/turnserver
install README.turnserver /usr/local/share/doc/turnserver
install README.turnadmin /usr/local/share/doc/turnserver
install README.turnutils /usr/local/share/doc/turnserver
install INSTALL /usr/local/share/doc/turnserver
install postinstall.txt /usr/local/share/doc/turnserver
install turndb/schema.sql /usr/local/share/doc/turnserver
install turndb/schema.sql /usr/local/share/turnserver
install turndb/schema.mongo.sh /usr/local/share/doc/turnserver
install turndb/schema.mongo.sh /usr/local/share/turnserver
install turndb/testredisdbsetup.sh /usr/local/share/turnserver
install turndb/testmongosetup.sh /usr/local/share/turnserver
install turndb/testsqldbsetup.sql /usr/local/share/turnserver
install turndb/schema.userdb.redis /usr/local/share/doc/turnserver
install turndb/schema.userdb.redis /usr/local/share/turnserver
install turndb/schema.stats.redis /usr/local/share/doc/turnserver
install turndb/schema.stats.redis /usr/local/share/turnserver
if [ -f sqlite/turndb ] ; then install sqlite/turndb /usr/local/var/db/turndb; fi
install examples/etc/turnserver.conf /usr/local/etc/turnserver.conf.default
cp -rpf examples/etc /usr/local/share/examples/turnserver
cp -rpf examples/scripts /usr/local/share/examples/turnserver
rm -rf /usr/local/share/examples/turnserver/scripts/rfc5769.sh
cp -rpf include/turn/client /usr/local/include/turn
install include/turn/ns_turn_defs.h /usr/local/include/turn
cat /usr/local/share/doc/turnserver/postinstall.txt
==================================================================
1) If your system supports automatic start-up system daemon services,
then to enable the turnserver as a system service that is automatically
started, you have to:
a) Create and edit /etc/turnserver.conf or
/usr/local/etc/turnserver.conf .
Use /usr/local/etc/turnserver.conf.default as an example.
b) For user accounts settings: set up SQLite or PostgreSQL or
MySQL or MongoDB or Redis database for user accounts.
Use /usr/local/share/turnserver/schema.sql as SQL database schema,
or use /usr/local/share/turnserver/schema.userdb.redis as Redis
database schema description and/or
/usr/local/share/turnserver/schema.stats.redis
as Redis status & statistics database schema description.
If you are using SQLite, the default database location is in
/var/db/turndb or in /usr/local/var/db/turndb or in /var/lib/turn/turndb.
c) add whatever is necessary to enable start-up daemon for the
/usr/local/bin/turnserver.
2) If you do not want the turnserver to be a system service,
then you can start/stop it "manually", using the "turnserver"
executable with appropriate options (see the documentation).
3) To create database schema, use schema in file
/usr/local/share/turnserver/schema.sql.
4) For additional information, run:
$ man turnserver
$ man turnadmin
$ man turnutils
==================================================================
4、配置
在bin目录下生成六个可执行文件
turnadmin turnutils_peer.exe turnutils_stunclient.exe turnserver.exe turnutils_rfc5769check.exe turnutils_uclient.exe
turnserver.exe 就是我们需要的服务器.
turnadmin 用来管理账户.
turnutils_stunclient.exe 用于测试stun服务
turnutils_uclient.exe 用于测试turn服务. 模拟多个UDP,TCP,TLS or DTLS 类型的客户端
example 目录主要是示范如何配置和使用turn. 包含一些测试用例.
example/etc 下是pem证书和conf配置文件
example/var/db 下是sqlite的db库. 用于示范数据库的格式.
coturn 支持三种配置. 命令行, conf文件和数据库.
数据库支持sqlite, mysql, postgresql, MongoDB, redis.目前测试的Cygwin环境下编译的coTurn不支持MongoDB和redis,因为暂时用不到,所以也就没有查找如何才能编译支持到上述数据库
更具体的说明可以看源码目录下的README.turnserver README.turnadmin README.turnutils
examples\scripts 下一些测试用例:
loadbalance 示范如何进行负载均衡. 设置一个master turn server 然后配置若干个slave turn server.
longtermsecure 示范如何使用long-term 验证
longtermsecuredb 与 longtermsecure 类似, 不过是从数据库配置
shorttermsecure 示范如何使用short-term验证.
restapi 示范了web方面的使用.
stun 定义了两种验证方式.
Long-Term Credential
具体可以参考stun标准 http://tools.ietf.org/html/rfc5389#section-15.4
若用于WebRTC,必须使用long-term
简单配置:
turnserver -o -a -f -v --mobility -m 10 --max-bps=100000 --min-port=32355 --max-port=65535 --user=webrtc0
:webrtc
1234 --user=webrtc1
:webrtc
1234 -r demo
-m 10 表示启动十个relay线程.
当TURN Server用于WebRTC时,必须使用long-term credential mechanism, 即指定 -a 或者 --lt-cred-mech
--max-bps=100000 限制最大速度为100KB/s.
添加了两个用户webrtc0
和webrtc1
.
可以直接使用turnutils_uclient -u ling -w webrtc
1234 来测试. turnutils_uclient 有很多参数可以配置的.
1 2 3 4 5 |
|
下面的配置文件和上面的配置命令是两种方式,在实际应用中只能用一种。
在这里要注意,在bin路径下,建配置文件turnserver.conf,内容为:
listening-ip=192.168.1.113//这是个公网ip
listening-port=3478
#relay-ip=0.0.0.0
external-ip=0.0.0.0
min-port=59000
max-port=65000
Verbose
fingerprint
no-stdout-log
syslog
cert=pem/turn_server_cert.pem
pkey=pem/turn_server_pkey.pem
user=demo:demo
no-tcp
no-tls
no-tcp-relay
stun-only
#secure-stun
如果用的是阿里云服务器,要开放3478端口,tcp、udp都打开。
这里turnserver就开启成功了,测试可以用https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/ 来测试服务器是否成功。
Short-Term Credential
参考链接:
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文章浏览阅读373次。att has N friends. They are playing a game together. Each of Matt’s friends has a magic number. In the game, Matt selects some (could be zero) of his friends. If the xor (exclusive-or) sum of the selected friends’magic numbers is no less than M , Matt wi_matt has n friends. they are playing a game together.
文章浏览阅读8.4k次,点赞6次,收藏29次。开发环境和生产环境的配置和打包方式有所不同,下面是基于vue3+vite+ts项目的开发环境和生产环境配置及打包方式的详细说明。打包完成后会在项目根目录下生成dist目录,里面包含了打包后的静态文件和index.html文件,可以直接部署到服务器上。这里配置了三个命令,分别是开发环境启动命令、开发环境打包命令和生产环境打包命令。1.3 配置.env.development。2.2 配置.env.production。1.2 配置vite.config.ts。2.1 配置vite.config.ts。_vite打包配置
文章浏览阅读2w次,点赞4次,收藏91次。目录1. window10中下载ubuntu镜像2. 制作U盘启动盘3. Ubuntu 分配硬盘空间1. window10中下载ubuntu镜像下载地址2. 制作U盘启动盘安装制作工具:UltraISO(点我下载),下载完成后安装插入用来做启动盘的U盘(最好是usb3.0接口,16GB或以上),并清空里面的文件打开安装好的UltraISO,点击继续试用按钮工作界面进入工作界面后,点击菜单栏文件(F),在弹出的选项卡里点击打开在弹出的文件选择对话框中找到下载好的 Ubuntu18.04._ubuntu18.04
文章浏览阅读203次。2019独角兽企业重金招聘Python工程师标准>>> ..._toad no valid oracle client
文章浏览阅读553次,点赞2次,收藏2次。代码已提交至Github,有兴趣的同学可以下载来看看(git版本号:bea4d6f7ec9f7309033bcfa43316a660171ae5b6):https://github.com/ylw-github/Zookeeper-Demo本文目录结构:l____1. 知识点回顾l________1.1 多线程l________1.2 Java共享内存模型l____2. 分布式锁的解决方..._分布式锁 的具体实现工具
文章浏览阅读9.3k次,点赞9次,收藏51次。Nginx网站服务详解,Nginx服务的主配置文件,修改,监听,配置,密码认证,以及IP和端口虚拟主机配置方法,含图文步骤拆解讲解_nginx.conf
文章浏览阅读10w+次,点赞266次,收藏1.1k次。目录一、Synchronized使用场景二、Synchronized实现原理三、锁的优化1、锁升级2、锁粗化3、锁消除一、Synchronized使用场景Synchronized是一个同步关键字,在某些多线程场景下,如果不进行同步会导致数据不安全,而Synchronized关键字就是用于代码同步。什么情况下会数据不安全呢,要满足两个条件:一是数据共享(临界资源),二..._3.轻量级锁
文章浏览阅读731次。堆积树排序法是选择排序法的改进版,可以减少在选择排序法中的比较次数,进而减少排序时间。堆积排序法用到了二叉树的技巧,是利用堆积树来完成排序的。堆积树是一种特殊的二叉树,可分为最大堆积树和最小堆积树两种。
文章浏览阅读917次。1.hdfs核心参数——回收站设置第一步,在调优前我们需要对namenode与datanode的内存配置进行参数化设置。通过hadoop-env.sh查看namenode与datdanode的具体参数。相关参数设置如下export HDFS_NAMENODE_OPTS=”-Dhadoop.security.logger=INFO,RFAS -Xmx1024m”export HDFS_DATANODE_OPTS=”-Dhadoop.security.logger=ERROR,RFAS -Xmx10_hadoop_namenode_opts
文章浏览阅读1.9w次,点赞2次,收藏27次。Studio 3T试用期过了不能使用,网上未搜索到相对应的激活码,可以选择重置使用时间继续使用。_studio 3tjihuoma