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环境:
系统 |
IP 地址 |
主机名(登录用户) |
承载角色 |
CentOS 7.4 64Bit 1611 |
10.199.100.170 |
dlp(yzyu) ceph-client(root) |
admin-node ceph-client |
Centos 7.4 64Bit 1611 |
10.199.100.171 |
node1(yzyu) 添加一块硬盘 |
mon-node osd0-node mds-node |
Centos 7.4 64Bit 1611 |
10.199.100.172 |
node2(yzyu) 添加一块硬盘 |
mon-node osd1-node |
-
配置基础环境
[root@dlp ~]# useradd yzyu
[root@dlp ~]# echo "dhhy" |passwd --stdin dhhy
[root@dlp ~]# cat <<END >>/etc/hosts
10.199.100.170 dlp
10.199.100.171 node1
10.199.100.172 node2
END
[root@dlp ~]# echo "yzyu ALL = (root) NOPASSWD:ALL" >> /etc/sudoers.d/yzyu
[root@dlp ~]# chmod 0440 /etc/sudoers.d/yzyu
[root@node1~]# useradd yzyu
[root@node1 ~]# echo "yzyu" |passwd --stdin yzyu
[root@node1 ~]# cat <<END >>/etc/hosts
10.199.100.170 dlp
10.199.100.171 node1
10.199.100.172 node2
END
[root@node1 ~]# echo "yzyu ALL = (root) NOPASSWD:ALL" >> /etc/sudoers.d/yzyu
[root@node1 ~]# chmod 0440 /etc/sudoers.d/yzyu
[root@node2 ~]# useradd yzyu
[root@node2 ~]# echo "yzyu" |passwd --stdin yzyu
[root@node2 ~]# cat <<END >>/etc/hosts
10.199.100.170 dlp
10.199.100.171 node1
10.199.100.172 node2
END
[root@node2 ~]# echo "yzyu ALL = (root) NOPASSWD:ALL" >> /etc/sudoers.d/yzyu
[root@node2 ~]# chmod 0440 /etc/sudoers.d/yzyu
-
配置 ntp 时间服务
[root@dlp ~]# yum -y install ntp ntpdate
[root@dlp ~]# sed -i '/^server/s/^/#/g' /etc/ntp.conf
[root@dlp ~]# sed -i '25aserver 127.127.1.0\nfudge 127.127.1.0 stratum 8' /etc/ntp.conf
[root@dlp ~]# systemctl start ntpd
[root@dlp ~]# systemctl enable ntpd
[root@dlp ~]# netstat -lntup
[root@node1 ~]# yum -y install ntpdate
[root@node1 ~]# /usr/sbin/ntpdate 10.199.100.170
[root@node1 ~]# echo "/usr/sbin/ntpdate 10.199.100.170" >>/etc/rc.local
[root@node1 ~]# chmod +x /etc/rc.local
[root@node2 ~]# yum -y install ntpdate
[root@node2 ~]# /usr/sbin/ntpdate 10.199.100.170
[root@node2 ~]# echo "/usr/sbin/ntpdate 10.199.100.170" >>/etc/rc.local
[root@node2 ~]# chmod +x /etc/rc.local
-
分别在 dlp 节点、node1、node2 节点上安装 Ceph
[root@dlp ~]# yum -y install yum-utils
[root@dlp ~]# yum-config-manager --add-repo https://dl.Fedoraproject.org/pub/epel/7/x86_64/
[root@dlp ~]# yum -y install epel-release --nogpgcheck
[root@dlp ~]# cat <<END >>/etc/yum.repos.d/ceph.repo
[Ceph]
name=Ceph packages for \$basearch
baseurl=http://mirrors.163.com/ceph/rpm-jewel/el7/\$basearch
enabled=1
gpgcheck=0
type=rpm-md
gpgkey=https://mirrors.163.com/ceph/keys/release.asc
priority=1
[Ceph-noarch]
name=Ceph noarch packages
baseurl=http://mirrors.163.com/ceph/rpm-jewel/el7/noarch
enabled=1
gpgcheck=0
type=rpm-md
gpgkey=https://mirrors.163.com/ceph/keys/release.asc
priority=1
[ceph-source]
name=Ceph source packages
baseurl=http://mirrors.163.com/ceph/rpm-jewel/el7/SRPMS
enabled=1
gpgcheck=0
type=rpm-md
gpgkey=https://mirrors.163.com/ceph/keys/release.asc
priority=1
END
[root@dlp ~]# ls /etc/yum.repos.d/ ## 必须保证有默认的官网源,结合 epel 源和网易的 ceph 源,才可以进行安装;
bak CentOS-fasttrack.repo ceph.repo
CentOS-Base.repo CentOS-Media.repo dl.fedoraproject.org_pub_epel_7_x86_64_.repo
CentOS-CR.repo CentOS-Sources.repo epel.repo
CentOS-Debuginfo.repo CentOS-Vault.repo epel-testing.repo
[root@dlp ~]# su - yzyu
[dhhy@dlp ~]$ mkdir ceph-cluster ## 创建 ceph 主目录
[dhhy@dlp ~]$ cd ceph-cluster
[dhhy@dlp ceph-cluster]$ sudo yum -y install ceph-deploy ## 安装 ceph 管理工具
[dhhy@dlp ceph-cluster]$ sudo yum -y install ceph --nogpgcheck ## 安装 ceph 主程序
[root@node1 ~]# yum -y install yum-utils
[root@ node1 ~]# yum-config-manager --add-repo https://dl.fedoraproject.org/pub/epel/7/x86_64/
[root@node1 ~]# yum -y install epel-release --nogpgcheck
[root@node1 ~]# cat <<END >>/etc/yum.repos.d/ceph.repo
[Ceph]
name=Ceph packages for \$basearch
baseurl=http://mirrors.163.com/ceph/rpm-jewel/el7/\$basearch
enabled=1
gpgcheck=0
type=rpm-md
gpgkey=https://mirrors.163.com/ceph/keys/release.asc
priority=1
[Ceph-noarch]
name=Ceph noarch packages
baseurl=http://mirrors.163.com/ceph/rpm-jewel/el7/noarch
enabled=1
gpgcheck=0
type=rpm-md
gpgkey=https://mirrors.163.com/ceph/keys/release.asc
priority=1
[ceph-source]
name=Ceph source packages
baseurl=http://mirrors.163.com/ceph/rpm-jewel/el7/SRPMS
enabled=1
gpgcheck=0
type=rpm-md
gpgkey=https://mirrors.163.com/ceph/keys/release.asc
priority=1
END
[root@node1 ~]# su - yzyu
[dhhy@node1 ~]$ mkdir ceph-cluster
[dhhy@node1~]$ cd ceph-cluster
[dhhy@node1 ceph-cluster]$ sudo yum -y install ceph-deploy
[dhhy@node1 ceph-cluster]$ sudo yum -y install ceph --nogpgcheck
[dhhy@node1 ceph-cluster]$ sudo yum -y install deltarpm
[root@node2 ~]# yum -y install yum-utils
[root@ node1 ~]# yum-config-manager --add-repo https://dl.fedoraproject.org/pub/epel/7/x86_64/
[root@node2 ~]# yum -y install epel-release --nogpgcheck
[root@node2 ~]# cat <<END >>/etc/yum.repos.d/ceph.repo
[Ceph]
name=Ceph packages for \$basearch
baseurl=http://mirrors.163.com/ceph/rpm-jewel/el7/\$basearch
enabled=1
gpgcheck=0
type=rpm-md
gpgkey=https://mirrors.163.com/ceph/keys/release.asc
priority=1
[Ceph-noarch]
name=Ceph noarch packages
baseurl=http://mirrors.163.com/ceph/rpm-jewel/el7/noarch
enabled=1
gpgcheck=0
type=rpm-md
gpgkey=https://mirrors.163.com/ceph/keys/release.asc
priority=1
[ceph-source]
name=Ceph source packages
baseurl=http://mirrors.163.com/ceph/rpm-jewel/el7/SRPMS
enabled=1
gpgcheck=0
type=rpm-md
gpgkey=https://mirrors.163.com/ceph/keys/release.asc
priority=1
END
[root@node2 ~]# su - yzyu
[dhhy@node2 ~]$ mkdir ceph-cluster
[dhhy@node2 ~]$ cd ceph-cluster
[dhhy@node2 ceph-cluster]$ sudo yum -y install ceph-deploy
[dhhy@node2 ceph-cluster]$ sudo yum -y install ceph --nogpgcheck
[dhhy@node2 ceph-cluster]$ sudo yum -y install deltarpm
-
在 dlp 节点管理 node 存储节点,安装注册服务,节点信息
[yzyu@dlp ceph-cluster]$ pwd ## 当前目录必须为 ceph 的安装目录位置
/home/yzyu/ceph-cluster
[yzyu@dlp ceph-cluster]$ ssh-keygen -t rsa ## 主节点需要远程管理 mon 节点,需要创建密钥对,并且将公钥复制到 mon 节点
[yzyu@dlp ceph-cluster]$ ssh-copy-id dhhy@dlp
[yzyu@dlp ceph-cluster]$ ssh-copy-id dhhy@node1
[yzyu@dlp ceph-cluster]$ ssh-copy-id dhhy@node2
[yzyu@dlp ceph-cluster]$ ssh-copy-id root@ceph-client
[yzyu@dlp ceph-cluster]$ cat <<END >>/home/dhhy/.ssh/config
Host dlp
Hostname dlp
User yzyu
Host node1
Hostname node1
User yzyu
Host node2
Hostname node2
User yzyu
END
[yzyu@dlp ceph-cluster]$ chmod 644 /home/yzyu/.ssh/config
[yzyu@dlp ceph-cluster]$ ceph-deploy new node1 node2 ## 初始化节点
[yzyu@dlp ceph-cluster]$ cat <<END >>/home/yzyu/ceph-cluster/ceph.conf
osd pool default size = 2
END
[yzyu@dlp ceph-cluster]$ ceph-deploy install node1 node2 ## 安装 ceph
-
配置 Ceph 的 mon 监控进程
[yzyu@dlp ceph-cluster]$ ceph-deploy mon create-initial ## 初始化 mon 节点
注解:node 节点的配置文件在 /etc/ceph/ 目录下,会自动同步 dlp 管理节点的配置文件;
-
配置 Ceph 的 osd 存储
配置 node1 节点的 osd1 存储设备:
[yzyu@node1 ~]$ sudo fdisk /dev/sdc...sdc ## 格式化硬盘,转换为 GPT 分区
[yzyu@node1 ~]$ pvcreate /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1 /dev/sdi1 /dev/sdj1 /dev/sdk1 /dev/sdl1 /dev/sdm1 /dev/sdn1 /dev/sdo1 /dev/sdp1 /dev/sdq1 /dev/sdr1 /dev/sds1 /dev/sdt1 /dev/sdu1 /dev/sdv1 /dev/sdw1 /dev/sdx1 /dev/sdy1 /dev/sdz1 ## 创建 pv
[yzyu@node1 ~]$ vgcreate vg1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1 /dev/sdi1 /dev/sdj1 /dev/sdk1 /dev/sdl1 /dev/sdm1 /dev/sdn1 /dev/sdo1 /dev/sdp1 /dev/sdq1 /dev/sdr1 /dev/sds1 /dev/sdt1 /dev/sdu1 /dev/sdv1 /dev/sdw1 /dev/sdx1 /dev/sdy1 /dev/sdz1 ## 创建 vg
[yzyu@node1 ~]$ lvcreate -L 130T -n lv1 vg1 ## 划分空间
[yzyu@node1 ~]$ mkfs.xfs /dev/vg1/lv1 ## 格式化
[yzyu@node1 ~]$ sudo partx -a /dev/vg1/lv1
[yzyu@node1 ~]$ sudo mkfs -t xfs /dev/vg1/lv1
[yzyu@node1 ~]$ sudo mkdir /var/local/osd1
[yzyu@node1 ~]$ sudo vi /etc/fstab
/dev/vg1/lv1 /var/local/osd1 xfs defaults 0 0
:wq
[yzyu@node1 ~]$ sudo mount -a
[yzyu@node1 ~]$ sudo chmod 777 /var/local/osd1
[yzyu@node1 ~]$ sudo chown ceph:ceph /var/local/osd1/
[yzyu@node1 ~]$ ls -ld /var/local/osd1/
[yzyu@node1 ~]$ df -hT
[yzyu@node1 ~]$ exit
配置 node2 节点的 osd1 存储设备:
[yzyu@node2 ~]$ sudo fdisk /dev/sdc...sdc
[yzyu@node2 ~]$ pvcreate /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1 /dev/sdi1 /dev/sdj1 /dev/sdk1 /dev/sdl1 /dev/sdm1 /dev/sdn1 /dev/sdo1 /dev/sdp1 /dev/sdq1 /dev/sdr1 /dev/sds1 /dev/sdt1 /dev/sdu1 /dev/sdv1 /dev/sdw1 /dev/sdx1 /dev/sdy1 /dev/sdz1
[yzyu@node2 ~]$ vgcreate vg2 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1 /dev/sdi1 /dev/sdj1 /dev/sdk1 /dev/sdl1 /dev/sdm1 /dev/sdn1 /dev/sdo1 /dev/sdp1 /dev/sdq1 /dev/sdr1 /dev/sds1 /dev/sdt1 /dev/sdu1 /dev/sdv1 /dev/sdw1 /dev/sdx1 /dev/sdy1 /dev/sdz1
[yzyu@node2 ~]$ lvcreate -L 130T -n lv2 vg2
[yzyu@node2 ~]$ mkfs.xfs /dev/vg2/lv2
[yzyu@node2 ~]$ sudo partx -a /dev/vg2/lv2
[yzyu@node2 ~]$ sudo mkfs -t xfs /dev/vg2/lv2
[yzyu@node2 ~]$ sudo mkdir /var/local/osd2
[yzyu@node2 ~]$ sudo vi /etc/fstab
/dev/vg2/lv2 /var/local/osd2 xfs defaults 0 0
:wq
[yzyu@node2 ~]$ sudo mount -a
[yzyu@node2 ~]$ sudo chmod 777 /var/local/osd2
[yzyu@node2 ~]$ sudo chown ceph:ceph /var/local/osd2/
[yzyu@node2 ~]$ ls -ld /var/local/osd2/
[yzyu@node2 ~]$ df -hT
[yzyu@node2 ~]$ exit
dlp 管理节点注册 node 节点:
[yzyu@dlp ceph-cluster]$ ceph-deploy osd prepare node1:/var/local/osd1 node2:/var/local/osd2 ## 初始创建 osd 节点并指定节点存储文件位置
[yzyu@dlp ceph-cluster]$ chmod +r /home/yzyu/ceph-cluster/ceph.client.admin.keyring
[yzyu@dlp ceph-cluster]$ ceph-deploy osd activate node1:/var/local/osd1 node2:/var/local/osd2 ## 激活 ods 节点
[yzyu@dlp ceph-cluster]$ ceph-deploy admin node1 node2 ## 复制 key 管理密钥文件到 node 节点中
[yzyu@dlp ceph-cluster]$ sudo cp /home/dhhy/ceph-cluster/ceph.client.admin.keyring /etc/ceph/
[yzyu@dlp ceph-cluster]$ sudo cp /home/dhhy/ceph-cluster/ceph.conf /etc/ceph/
[yzyu@dlp ceph-cluster]$ ls /etc/ceph/
ceph.client.admin.keyring ceph.conf rbdmap
[yzyu@dlp ceph-cluster]$ ceph quorum_status --format json-pretty ## 查看 Ceph 群集详细信息
-
验证查看 ceph 集群状态信息
[yzyu@dlp ceph-cluster]$ ceph health
HEALTH_OK
[yzyu@dlp ceph-cluster]$ ceph -s ## 查看 Ceph 群集状态
cluster 24fb6518-8539-4058-9c8e-d64e43b8f2e2
health HEALTH_OK
monmap e1: 2 mons at {node1=10.199.100.171:6789/0,node2=10.199.100.172:6789/0}
election epoch 6, quorum 0,1 node1,node2
osdmap e10: 2 osds: 2 up, 2 in
flags sortbitwise,require_jewel_osds
pgmap v20: 64 pgs, 1 pools, 0 bytes data, 0 objects
10305 MB used, 30632 MB / 40938 MB avail ## 已使用、剩余、总容量
64 active+clean
[dhhy@dlp ceph-cluster]$ ceph osd tree
ID WEIGHT TYPE NAME UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 0.03897 root default
-2 0.01949 host node1
0 0.01949 osd.0 up 1.00000 1.00000
-3 0.01949 host node2
1 0.01949 osd.1 up 1.00000 1.00000
[yzyu@dlp ceph-cluster]$ ssh yzyu@node1 ## 验证 node1 节点的端口监听状态以及其配置文件以及磁盘使用情况
[yzyu@node1 ~]$ df -hT |grep lv1
/dev/vg1/lv1 xfs 20G 5.1G 15G 26% /var/local/osd1
[yzyu@node1 ~]$ du -sh /var/local/osd1/
5.1G /var/local/osd1/
[yzyu@node1 ~]$ ls /var/local/osd1/
activate.monmap active ceph_fsid current fsid journal keyring magic ready store_version superblock systemd type whoami
[yzyu@node1 ~]$ ls /etc/ceph/
ceph.client.admin.keyring ceph.conf rbdmap tmppVBe_2
[yzyu@node1 ~]$ cat /etc/ceph/ceph.conf
[global]
fsid = 0fcdfa46-c8b7-43fc-8105-1733bce3bfeb
mon_initial_members = node1, node2
mon_host = 10.199.100.171,10.199.100.172
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
osd pool default size = 2
[yzyu@dlp ceph-cluster]$ ssh yzyu@node2 ## 验证 node2 节点的端口监听状态以及其配置文件及其磁盘使用情况
[yzyu@node2 ~]$ df -hT |grep lv2
/dev/vg2/lv2 xfs 20G 5.1G 15G 26% /var/local/osd2
[yzyu@node2 ~]$ du -sh /var/local/osd2/
5.1G /var/local/osd2/
[yzyu@node2 ~]$ ls /var/local/osd2/
activate.monmap active ceph_fsid current fsid journal keyring magic ready store_version superblock systemd type whoami
[yzyu@node2 ~]$ ls /etc/ceph/
ceph.client.admin.keyring ceph.conf rbdmap tmpmB_BTa
[yzyu@node2 ~]$ cat /etc/ceph/ceph.conf
[global]
fsid = 0fcdfa46-c8b7-43fc-8105-1733bce3bfeb
mon_initial_members = node1, node2
mon_host = 10.199.100.171,10.199.100.172
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
osd pool default size = 2
-
配置 Ceph 的 mds 元数据进程
[yzyu@dlp ceph-cluster]$ ceph-deploy mds create node1
[yzyu@dlp ceph-cluster]$ ssh dhhy@node1
[yzyu@node1 ~]$ netstat -utpln |grep 68
(No info could be read for "-p": geteuid()=1000 but you should be root.)
tcp 0 0 0.0.0.0:6800 0.0.0.0:* LISTEN -
tcp 0 0 0.0.0.0:6801 0.0.0.0:* LISTEN -
tcp 0 0 0.0.0.0:6802 0.0.0.0:* LISTEN -
tcp 0 0 0.0.0.0:6803 0.0.0.0:* LISTEN -
tcp 0 0 0.0.0.0:6804 0.0.0.0:* LISTEN -
tcp 0 0 192.168.100.102:6789 0.0.0.0:* LISTEN -
[yzyu@node1 ~]$ exit
-
配置 Ceph 的 client 客户端
[yzyu@dlp ceph-cluster]$ ceph-deploy install ceph-client ## 提示输入密码
[dhhy@dlp ceph-cluster]$ ceph-deploy admin ceph-client
[yzyu@dlp ceph-cluster]$ su -
[root@dlp ~]# chmod +r /etc/ceph/ceph.client.admin.keyring
[yzyu@dlp ceph-cluster]$ ceph osd pool create cephfs_data 128 ## 数据存储池
pool 'cephfs_data' created
[yzyu@dlp ceph-cluster]$ ceph osd pool create cephfs_metadata 128 ## 元数据存储池
pool 'cephfs_metadata' created
[yzyu@dlp ceph-cluster]$ ceph fs new cephfs cephfs_data cephfs_metadata ## 创建文件系统
new fs with metadata pool 1 and data pool 2
[yzyu@dlp ceph-cluster]$ ceph fs ls ## 查看文件系统
name: cephfs, metadata pool: cephfs_data, data pools: [cephfs_metadata]
[yzyu@dlp ceph-cluster]$ ceph -s
cluster 24fb6518-8539-4058-9c8e-d64e43b8f2e2
health HEALTH_WARN
clock skew detected on mon.node2
too many PGs per OSD (320 > max 300)
Monitor clock skew detected
monmap e1: 2 mons at {node1=10.199.100.171:6789/0,node2=10.199.100.172:6789/0}
election epoch 6, quorum 0,1 node1,node2
fsmap e5: 1/1/1 up {0=node1=up:active}
osdmap e17: 2 osds: 2 up, 2 in
flags sortbitwise,require_jewel_osds
pgmap v54: 320 pgs, 3 pools, 4678 bytes data, 24 objects
10309 MB used, 30628 MB / 40938 MB avail
320 active+clean
-
测试 Ceph 的客户端存储
[root@ceph-client ~]# mkdir /mnt/ceph
[root@ceph-client ~]# grep key /etc/ceph/ceph.client.admin.keyring |awk ‘{print $3}’ >>/etc/ceph/admin.secret
[root@ceph-client ~]# cat /etc/ceph/admin.secret
AQCd/x9bsMqKFBAAZRNXpU5QstsPlfe1/FvPtQ==
[root@ceph-client ~]# mount -t ceph 10.199.100.171:6789:/ /mnt/ceph/ -o name=admin,secretfile=/etc/ceph/admin.secret
[root@ceph-client ~]# df -hT |grep ceph
10.199.100.171:6789:/ ceph 40G 11G 30G 26% /mnt/ceph
[root@ceph-client ~]# dd if=/dev/zero of=/mnt/ceph/1.file bs=1G count=1
记录了 1 +0 的读入
记录了 1 +0 的写出
1073741824 字节 (1.1 GB) 已复制,14.2938 秒,75.1 MB/ 秒
[root@ceph-client ~]# ls /mnt/ceph/
1.file
[root@ceph-client ~]# df -hT |grep ceph
10.199.100.171:6789:/ ceph 40G 13G 28G 33% /mnt/ceph
-
错误整理
1. 如若在配置过程中出现问题,重新创建集群或重新安装 ceph,那么需要将 ceph 集群中的数据都清除掉,命令如下;
[dhhy@dlp ceph-cluster]$ ceph-deploy purge node1 node2
[dhhy@dlp ceph-cluster]$ ceph-deploy purgedata node1 node2
[dhhy@dlp ceph-cluster]$ ceph-deploy forgetkeys && rm ceph.*
2.dlp 节点为 node 节点和客户端安装 ceph 时,会出现 yum 安装超时,大多由于网络问题导致,可以多执行几次安装命令;
3.dlp 节点指定 ceph-deploy 命令管理 node 节点配置时,当前所在目录一定是 /home/dhhy/ceph-cluster/,不然会提示找不到 ceph.conf 的配置文件;
4.osd 节点的 /var/local/osd*/ 存储数据实体的目录权限必须为 777,并且属主和属组必须为 ceph;
5. 在 dlp 管理节点安装 ceph 时出现以下问题
解决方法:
1. 重新 yum 安装 node1 或者 node2 的 epel-release 软件包;
2. 如若还无法解决,将软件包下载,使用以下命令进行本地安装;
6. 如若在 dlp 管理节点中对 /home/yzyu/ceph-cluster/ceph.conf 主配置文件发生变化,那么需要将其主配置文件同步给 node 节点,命令如下:
node 节点收到配置文件后,需要重新启动进程:
7. 在 dlp 管理节点查看 ceph 集群状态时,出现如下,原因是因为时间不一致所导致;
将 dlp 节点的 ntpd 时间服务重新启动,node 节点再次同步时间即可,如下所示:
8. 在 dlp 管理节点进行管理 node 节点时,所处的位置一定是 /home/yzyu/ceph-cluster/,不然会提示找不到 ceph.conf 主配置文件;
: